I was not always a photographer. I used to be a project manager and before that a coder. (If you are you using Skype, Comcast voice or TimeWarner cable modems, you are probably running my code daily). One thing that we were thought as coders is that it is a pain to memorize keyboard shortcuts, but once memorized, it is significantly faster to work with keyboard only than with mouse and keyboard combined.
This is especially true for programs like Lightroom where items are hidden in sub-menus and issuing a command looks kinda like this: take hand off keyboard; find the right menu; the right sub menu; click command; regain hands-on-keyboard position.