I passenger a lot too. For this reason I do not listen to the safety briefing because I know it by hard.
What a stupidly arrogant attitude ... even more so if you are crew!
I don't travel too much but I can still probably give a fair representation of a safety briefing, but the first thing I always do after stowing my carry on and doing up my seatbelt is to reach for the safety card, which I then read cover to cover. I then conscientiously watch and listen to the safety briefing. How am I to know that one day they may choose to change something significant? How am I to know that the one thing that sticks in my head this time around might be the one thing I need to know to save my life ... or the one minor item that I forgot isn't going to be the one that kills me or the person next to me?