Switching to an ergonomic mechanical keyboard (kinesis advantage) and a keyboard-heavy workflow (vim) allows me to work as a developer.
I can tell how often I resort to using the mouse each day by the pain when I get home (I have a trackball on my left hand side and a touchpad on my right hand side to try alleviate this), thanks to not using the mouse all day I can often game for a few hours without too much trouble.
This isn't necessary specific to vim, however vim's modality and extremely expressive command language really minimize the amount of movement I need to do for any given action, no more emacs-pinky for me.