About two years ago Tavis Rudd, developed a bad case of RSI caused by typing lots of code using Emacs. It was so severe that his hands went numb and he could no longer work. After trying all of the standard "conventional" solutions, such as different keyboard and generally paying attention to the ergonomics of his work station, nothing helped. As he puts it: "Desperate, I tried voice recognition".
One more reason to use VIM.