In my military circles, we call this "muscle memory" (although it probably exists elsewhere, too). Do a physical movement, like drawing a pistol from a holster, a couple thousand times and it seeps into your brain so that you don't have to think about it.

For instance, I have this really annoying keystroke memory in my fingers. If I want to change into a directory, I type "cd <return>", then out of nowhere I type "make <return>" even if that is not what I meant to do. I just do that sequence so often that it flows right out. Even worse than that is "make test <return>" showing up at any random coomand prompt.