Not really. The only thing I've ever really hated doing is bleeding hydraulic brakes and servicing/rebuilding MTB forks. Luckily, there's a kid who helps out around here from time to time who loves doing that crap and is good at it. Even when I have to do something that sucks, I just think about how I'm making a living screwing around with bikes all day long.

A guy recently came in with an old Cannondale that needed a new BB and I literally could not remove the old one, no matter what I tried. After a few days of swearing at the damn thing, I was bending/breaking tools left and right and managed to pull a muscle in my shoulder. I was worried I would break his damn BB shell right off (or suffer a hernia) so I finally dropped it off at a friend's machine shop. I have no idea what he did but he had it back to me in 45 minutes. Bastard.