My boys are 8 and 12. The thing that I think they liked the best is....I make "thank you for making our trip extra magical" thank you cards to hand out to CM's that go out of there way(it has my kids picture on it with different characters). They love these. They hold onto them like they are gold. I think it makes them "stop and smell the roses" because they aren't in such a hurry to go and do. They slow down and pay attention to who and what is going on around them.
I also by the glow sticks.
I also buy matching t-shirts for the family (some Disney) for us to wear everyday. This started when they were little so that if they got lost they could look at there own shirt and be able to tell a CM what there parents were wearing (instead of trying to remember while being freaked out). Now it works so they can find us at the exit of a ride if we don't ride together.
We also buy pins online. They keep their best pins at home so they aren't tempted to trade them. They also do the pressed pennies.