Once you get to a certain level, counterpicking will become your new god. You will think about counter picking when you are sleeping, eating, and crapping. You will run through the scenarios in your dreams.
Can you beat X with Y? What about with Z jungler? How many times does Z gank?
You will think about how many wards you want to buy, and what kind of build you want to have. What kind of skill order you want.
You will eat, sleep, and poop counter picks.