Watching the safety demonstration is very important and should be watched even if you fly every week. The exits can be different on different types of plane.
The guys who work offshore have to watch a full safety briefing every 2 week trip and also do an emergency drill every trip despite seeing it dozens of times before.
If, God forbid, I am ever in an emergency situation, I hope my escape isn't hampered by people who suddenly panic when they realised they don't know what to do because they saw the safety briefing a year ago.
luci