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.
I’ve been using a Tex yoda ii for years and I love it. If you want to avoid leaving “home row” nothing beats a 60% keyboard with a trackpoint! I just bought a Tex Shura but haven’t tried it out yet.
I don't ruthlessly reduce mouse use, but I prefer to stick the keyboard for a handful of reasons: speed, comfort, reducing the likelihood of repetitive stress injury as I age, and flexibility. If my trackpad fails and I can't find a mouse, I can still do what I need to do.
I find that I prefer a graphical environment to understand what's going on, then a keyboard-focused environment (usually text based) once I reach the point that I know what to do and want to increase speed and repeatability.