Many times when editing in emacs I just "do the thing" without consciously knowing what keys I pressed.
If given a keyboard with no keys labeled, I would not easily know what each key was. Just the same, I could look away from it and type the alphabet. Magic.
More than once I've tried to describe a feature to some other Emacs user, and had to physically put my hands on a keyboard and watch them in order to say which keys were used to invoke it.
(Not on a touchscreen at least)
It's exactly like how you totally forget PINs, phone numbers, or passwords once you've typed them enough. You need a keypad in front of you (or at least to pretend there's one) and to just let your fingers do what they've done so many times before in order to figure it out.
I don't do well with laptops and mac keyboards due to their nonstandard key arrangements though.
That happened to me once, the electrician had to change the electricity meter, he called me to ask for the code to enter the flat and I couldn't recall it; I had to go down and open the door.
My favorite laptop keyboard is the first gen macbook pro. Great comfortable concave keys with good throw. Some thinkpads were good too.