When visiting Disney, one of the small rewarding experiences you can have is to take family pictures for people. I'm sure some people feel like they might be inconveniencing other guests, but most people will gladly help out. We've all been in a situation where we want the entire group in a shot, but someone always gets left out. Or we have desperate situations where we'll just sit our camera on a wall, set the timer, and hope for the best (God forbid the wind is strong, and it knocks your camera on the ground.... UGH!!!).
I was recently at Epcot, and saw a family resting the camera on the wall and setting the timer. I was the only other person even near them, so I couldn't NOT help out. And to make it even better, they were just completely grateful!!!