Believe or not, you can go 100% keyboard-only even on Windows. I had a friend, Win server admin (big Microsoft fun), who wasn't using mouse at all.
I tried it for a while, after seeing my Eve Online friend skipping through tasks at a rate of knots without any mouse movement. My god the amount of tab pressing I had to do to get anything done was crippling. I might have to jump through 15 times to get to something that would take me less than a second to click.