NetBeans is not so bad
A second vote in favor of NetBeans. It seems to run faster than Eclipse for me, does more useful things for my kind of work (Ruby hints, working auto-indenter, supports esoteric things like ERb and HAML) and it generally just gets out of the way. It won't force me to create a workspace and it happily puts together a fully working project around already existing code, without messing anything up. It supports Subversion, git, Mercurial, CVS and others.
There are just a few things to nitpick about (no "Save as..." feature when working on a versioned project, instead you have to copy/paste the file for example), but all in all, it's my favorite "fat" IDE.
Disclaimer: 6.1 is the first version I've used, and now I'm trying 6.5, so if it sucked before that, I'm not claiming it didn't :)