I know certain shots til the point I don't have to think about them. It might take a player 100+ intentional shots to learn how 2 rail shape works, where it breaks down, etc., but once you understand that you can just let your subconscious extrapolate. Just look at the shot, it looks good or it don't. I'm not bashing systems or physics either, knowing what to expect, where the author says the system breaks down, and testing your limits against what you read, etc. is a great way too.
That said, I still don't know the price of tea in China.