Heh, have you ever had someone ask you what keybinding did something, and you had to actually move your hand to recall it? (That may be more specifically a skilled-at-emacs thing, then entirely generic typing...)
At work I was given a generated password (not my login password for context) of random words with numbers replacing/inserted at random points which I quickly memorized and used several times a day.
After touch typing it through muscle memory for 6 or so months one day I misentered it a few times in a row, and I realized I had no idea what I actually had been typing the whole time (I knew the dictionary words, but the combination of numbers and where they appeared was the issue). Spent a while trying to zone out and let the muscle memory take over again but didn't work and finally gave up and asked for it to be reset.
Relatedly, I type both sides of matching pairs (parens, quotes, braces, etc.) and then left-arrow back into them to fill them with content. This is convenient to keep them balanced and because they are awkward to produce so I might as well do both in one motion.
When people see it they sometimes ask me what keyboard shortcut that was, but no, I just typed them and backed into them.
I feel this for my passwords. I can type my password without thinking about individual characters but if I need to recall it I'll have to move my hands.
