[Too]

Another annoying one is redo, they use ctrl+shift+z instead of ctrl+y. I've lost lots of code thanks to this after undoing something which i tried to redo but instead got the current code modified and the undo-stack wiped. (i might have been able to recover it in the local history but usually i'm too lazy to go dig so deep)

[Aeolos]

I hate software that uses ctrl-y instead of ctrl-shift-z. I guess it really depends on what you were exposed to first.