I personally don't mind touchwiz on the S3 one bit. I've been giving Nova a try because for one, I don't like the app drawer button on the right of the dock...I want it in the middle. Minor annoyance, but none the less, with Nova I can change that. The big one though is being able to restore homescreen configurations after a ROM install, which saves a ton of time and frustration. If TW or other stock launchers made it easy to backup/restore homescreen configs, I'd probably not bother with a 3rd party launcher at all.