Last month I was only asked once, at the foodcourt at our resort. I thought that I would have to show ID or AP each time I used it.
The other thing that amazed me was that I had my AP activated on first day at Disney last month. We spent 3 days at the parks, and went to 2 parks per day. My fingers only worked about twice, each time they had to reset it, and that never seemed to do the trick. Never once, did they ask for ID. They asked my name, and how to spell it.
What would prevent me from giving my pass to someone else and they could reset yet again? No, I would not do this, but I thought that the finger thing was supposed to prevent this. My friend that went with me had the same problem with her 5 day pass, her fingers only worked about twice, and they had to keep reseting hers too.........................