It definitely changes the way you watch a game. Even watching a game on TV, I often find myself counting offensive players in the huddle, looking for subs coming in, and once the line up looking at the formation to make sure they're legal, checking numbers positions, etc.
The superstar.....sadly unless he's the QB, the LG, or one of the defensive rushers, I probably won't see much of him. I often here the BJ or wing talk about these spectacular plays down field, and I never see them. In fact many times I don't know whether the ball is dropped or caught. You have your keys, then your area of responsibility, and that's your sole focus.