In addition to using text editors like vim or emacs and using a tiling window manager, what other programs do you use to reduce usage of the mouse? I recently discovered warpd which is similar to vimium's hint mode but works globally.
If you do a lot with your keyboard, it is annoying to get your hand off it and switch to your mouse. And then to switch back. If a task can also be done with the keyboard, you can just stay there and that is quite comfy.