Edit: downvotes? :(
IF I were that interested in a book,(THEN) I'd just learn the language of the original (Sanskrit for the BG) and read the original. Most translations miss many nuances.
From a story standpoint, it's your typical fantasy fiction stuff and not all that unique. But her writing style fascinates me: she leverages stream of consciousness as a primary literary device, and perception and perspective are major components of her plots.
Her books triggered a subtle yet lasting shift in the way I think and communicate, which has directly and positively impacted countless aspects of my life. It caused me to take my introspective nature and apply the same mental framework to other people's thought processes, drastically ratcheting up my ability to be empathetic, spot and resolve assumptions & points of miscommunication between people, and fluidly transition between completely disparate communication styles to address widely different perspectives/concerns on things.
All because she used perspective, perception in a way that has forever-since caused me to be cognizant of and suspicious of implicit assumptions and ambiguity everywhere.
Other favourites include the Vlad Taltos novels by Brust which I've read at least ten times each (still thinking "WTF?" over Vallista though!) and Les Liaisons dangereuses by Pierre Choderlos de Laclos.
My tastes tend towards SciFi & Fantasy, but I have no shame about my love of romance either.
(The last set of books I read were the complete Bond novels by Ian Fleming. I don't think I'd read them again, very dated, very different to the films, and not that great.)
I've read most of Terry Pratchett's books a few times each, some more than others, along with other "comedy" writers such as Jasper Fforde, and Tom Holt (his "Portable Door" series is my favourite.)
"Go Dog, Go!", maybe a hundred times
"HOP ON POP", maybe a hundred times
As it turns out, this was normal for kids to do, but it also ment I needed to get some new books.
What I should have done was point to each word as he said it to emphasis the the coorlation.
Dune, by Frank Herbert, comes a close second. I've read that at least a dozen times or more. It took me ages to get it. My dad had a copy, and I'd tried to read it probably 4 or 5 times, never getting far. Then I watched the David Lynch movie, went back to it and just devoured the book in a couple of days. Even though the two are wildly different, something about the movie gave me that kick I needed to get me in to the book.
I'm really not one for re-reading books all that much. Most books I read once. The ones I do re-read, I've read maybe 2 or 3 times.
There are usually two different reasons why one might re-read a book. Sometimes it is to see the book again through older eyes which have seen and known more. Other times it is to try to re-capture the emotional experience of living in that story. I find that I tend to come back to certain books much more often for the second reason than for the first one. I might feel the desire to re-read Quantum Computing without Magic or Theory of Internal Combustion Engines once a decade at most. But when I'm feeling that the world is a confusing place and I need some simplicity in my life, I'm ready to take a journey to the Lonely Mountain.
I've read the Lord of the Rings 3 - 4 times, which I feel is a lot for a pretty thick series.
Lord of the Flies: 3 - 4 reads
1984: 3 - 4 reads
A Clockwork Orange: 3 reads
Brave New World: 4 reads
I really like dystopian fiction I guess.
* The Greatest Salesman in the World 
* Masters of Doom: How Two Guys Created an Empire and Transformed Pop Culture 
*  https://www.goodreads.com/review/show/1875763811
*  https://www.goodreads.com/review/show/1875765552
*  https://www.goodreads.com/review/show/1875771565
What's interesting -- to me, anyway -- are the responses that are (a) books you might not be able to pay me to read or (b) books I enjoyed, but have never considered rereading.
I made it a couple of chapters into "The Lord of the Rings," tossed the book across the room, where it fell down behind some furniture and sat for years. I have never thought about reading it again.
I might need to go back and read both "Dune" and the Amber series. I enjoyed them; but, I've never thought about rereading them at all.
I've re-read them non-stop for ~20 years any time I don't have something else I'm excited to read. I discovered them as a teenager but still find them fascinating. I find new things to think about every time I read them.
Travels - Michael Crichton x10 at least
Fear - Thich Nhat Hanh x10 at least
Tunnels and Trolls Rulebook x100
An Oracle Server v7 book I got on my graduate training course before everything was online and an O'Reilly Unix Handbook
Code Complete and the Mythical Man Month
Godel Escher and Bach - tried to get through it in one several times
The balgariard a good number of times.
Magician often enough that the book is now just a pile of pages.
More recently I’ve been working through cheap books on kindle.
Michael Marshall Smith's early sci-fi books, Only Forward and Spares, have also had many re-reads.
I think the ideas are still very applicable, but some of the specifics might have changed.
On the Road by Kerouac.
Meditations by Marcus Aurelius.
I read Pessoa to feel not so alone. I read Kerouac to feel alive. I read Meditations to not lose my head.
Cryptonomicon a couple of times, and I’m planning on Anathem again.
The Dark Tower