I switched to Emacs for Org mode because I wasn't satisfied with any of the note-taking solutions I had tried (I had hundreds of pages of notes in various file formats). I now have an Org-mode-powered personal wiki that includes a few thousand documents. Even if I were to switch to another editor/IDE for programming (which I can't imagine doing at this point), I'd still use Emacs for note-taking.

I was a VIM guy for some 3 or 4 years... but then... I wanted to learn LISP. Aaand... you can't try to learn LISP without Emacs.

So, Emacs + Evil Mode and some months latter, I'm a full converted.

My last play-out with Emacs was org-mode... still learning it's awesomeness.