The more you do something, the more your brain makes space to do that exact thing. Which is (part of) why you do not need to think about how to move your legs when walking, remember the sound of reach letter while reading, and so on. You can also see this with other actions, like dribbling ball or typing at a computer. It’s essentially the same thing as muscle memory.
As for the forgetting part, my guess is that because the action does not require much attention any more, you get to either think about other things or just not spend much effort and cruise (so to speak.)
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