I was surprised how fast the (frequently inconsistent) keyboard commands just get into your fingers, where you don't think about it anymore.

Similarly for the graphics, and that applies to games in general. You really stop noticing the graphics around ~30mins into a session, because you're running this asynchronous simulation in your head that only needs minimal information to update. That might be a reason why we remember games we played a long time ago being a lot prettier or detailed.