I used to use Addon Studio in Windows... but mainly for the highlighting and the file tree view on the left. I only downloaded it instead of a normal text editor because I figured I'd get more use than that out of it.
Now I write mainly on Linux and just use gedit. The tabbed views are just as good as the file tree for what I do. ...and if I switched back to Windows development, I'd stop using Addon Studio.
If you take the time to learn it, vim/gvim will change how you program.
HERETIC! There is no editor other than Emacs! Thou shalt not use vi or any derivation thereof! ;D
Seriously though, unless you're willing to devote a LOT of time to learning either of these, and you expect to do a lot of coding or text editing (not word processing, that's different), don't bother. My main reason for liking Emacs over any "standard" text editing tool I've used is that all the necessary keys are accessible without moving your fingers from home row. Reaching over to hit the arrow keys is obnoxious. And Ainise is right, you must re-bind caps lock to ctrl.