I don't think aphantasia matters here.

I don't have a visual representation of the keyboard in my mind at all, but having touch typed (imperfectly) since high school, I can tell when I mistyped a key by feel too (eg. not looking at the output on the screen either, your muscle memory will let you know if any movement was awkard or unexpected).

FWIW, it's important to learn where the "corrective" (backspace, delete, cursor movement...) keys are on your keyboard while looking at the output: then you can easily push yourself to not look down on the keyboard while practicing.

Aphantastic here. I never learned to visualize a keyboard and went with blank keycaps to force myself to learn with weeks of painful brute force muscle memory. I learned Colemak which is much less finger travel and helped too as many words can be typed with home row.

I also do everything I possibly can on the command line because it is -one- interface to learn with a universal history to reference past commands vs randomly mucking about in GUI interfaces I can not picture in my head that are wildly different in every application.

Aphantastic here to say I have always had pretty great touch typing. In high school I would touch type on a HW keyboard phone - great to reply to texts while looking at my teacher for their presentation.

I do make mistakes but I don't feel particularly slow or error prone. As I said elsewhere I like to use the C-t command to fix letter swaps and I get them definitely less than once per normal day.

I never visualize the keyboard even though I could, it's all muscle memory.

Huh, maybe it has more to do with whether you type without looking or not?