So the folks at JetBrains have asked us to tell them how to make ReSharper better. They want you to fill out this questionnaire. It's hard to say what I like MOST about ReSharper, just about everything. Rename, templates, extract method, introduce variable, inline variable, the list goes on and on and on.
What do I like least? Exceptions, both the normal flavor and the "I just killed VS" flavor. They're not as frequent with VS 2005 and ReSharper 2.5.1. Load times when opening VS is another complaint, but at this point I'm complaining about details because everything else is good.
[Disclaimer: I have no vested interest in JetBrains. Well, none further than hoping they stick around to keep making my day to day development tasks easier/more enjoyable. If you guys are ever in need of a ReSharper Evangelist on the East Coast, let me know :) ]