It's a sprawling mess, so I rely on search to find what I'm after.
I reference it often -- it's like an extension of my brain.
Similarly, several years ago I added a keybind to my .vimrc that, by typing ",a" I'm moved to the bottom of the file and today's date with a separator line underneath. My leader key is "," and I mnemonically associate "a" with "append".
The earliest date recorded in it goes back to 2006 and is about 300KB in size. I still reference and add to it on a regular basis.