But you do switch how your mouth is working when switching between eating and drinking. In one, you masticate and move food around your mouth before swallowing once (maybe twice), whereas the other involves directing fluids back to your throat which acts in a near-continuous swallowing action.
> You have to remember so many key combinations and commands
They become muscle memory after an admittedly non-trivial amount of use. Yes, it is an investment in your future usage of that tool.
And to be fair, you had to memorize C-x, C-c, and C-v at one point too.
You might be surprised. Maybe not quite the level of a true "reflex", but it can get close. I find I not infrequently get weird compile/test/spellcheck errors when I'm not using vim and go back to find a string of vi keystrokes in the middle of my document that I typed without consciously realizing.