I can see the value, when it's done well, but the rather lacklustre arm waving doesn't tell much in some cases. It's much more useful on wide bodied aircraft.

The area the CC can really improve on is keeping people quiet during the demo. I get so angry with the "I fly 10 times a year, I don't need to listen or shut-up" attitude of some passengers. I fly at least 50 flights a year, and still watch the demo, listening to every bit. Is it because I'm stupid, or forgetful, or even polite? No, it's because the continual drumming-in of the information reinforces the memory in my brain. Should the worst happen, I'd like to think that the procedures would be almost second nature to me. Likewise I always check there IS a lifejacket under my seat, and always count the rows to the overwing exits. When they point out the exits I visually check them and count them off in my head. I know which are "inwards and upwards", which "inwards and downwards" and for which "the hatch should be ejected"

Back to the point. CC, some of you do an excellent job of this already, but for those who stand there and let the jabbering continue: please grow a pair and tell these people to shut up. Every time I do it I get a poor response from the crew (I'm polite in my request btw). Their attitude endangers my life and your life in the event of emergency. Be they jaded commuters or first-time tourists, they will ALWAYS respond better with the memory fresh.