Clearly the less understood thing about vim. People keep thinking this means "typing more words", while what it means is "having the change you have in mind faster on your screen". It's not about writing more code, it's about not having your code lagging compared to your brain.
Anyway, to me, this is not even the best feature of vim. The best feature is what vim creator mentioned : its ability to automate repetitive tasks, possibly short living (with macros). It's easy with vim to convert a file without writing a parser, just with macros. So yeah, I prefer to add IDE stuff on top of vim rather than using an other editor.