I can't be the only one. I'm faster overall in vi and xmonad with a browser window opened to the SDK docs than using arrow keys with code completion in XCode.
Interface Builder though, don't know how I lived without it when the first version of the SDK came out lacking it. shudder
Before someone says something about the xmonad thing and it sucking on the mac, I'm actually writing the code on a linux machine and building it on a mac via synergy :) Yes, it actually works pretty well!
Code completion is a pretty big factor when writing Cocoa, though.