I don't think it would make you a better programmer, but when you have THAT level, you will most likely use emacs ( or vi )
: - /
The good thing about those two ( I have never used emacs before, but I still use vi for the most mundane task ) is the fact, they don't interrupt your train of thought, you don't have to take your hands out of the keyboard to grab the mouse, and hunt in the file menu for the correct option. You just, keep writing. Inside your mind you say something like: "Replace all the occurrences of this word for that", press enter and continue with your work.
Besides, I don't think they use emacs is their only tool.
Would it make you better programmer? Probably not. But when you have that level of expertise, probably you will like how fast can you code using those tools.
