I lived in Emacs + Ruby/Python/Perl for most of 1998-2008 and I've recently been forced into IDEs to do mobile development in Obj-C and Java.
And I'm loving it. I never had this much visibility into my code or anything close to the refactoring power (especially in Java). Maybe things go south with 1mm LOC projects but those are no picnic in Emacs either. I've gotten so addicted to the benefits of a good IDE that I think I'll take a serious look at Rubymine if I ever go back to doing Rails again.
And I'm loving it. I never had this much visibility into my code or anything close to the refactoring power (especially in Java). Maybe things go south with 1mm LOC projects but those are no picnic in Emacs either. I've gotten so addicted to the benefits of a good IDE that I think I'll take a serious look at Rubymine if I ever go back to doing Rails again.