#2. I am incredibly biased when it comes to this subject.
I've seen plenty of the "spliced" photos with an individual who took a photo with a character as a child & as an adult.
Plus some of the meet & greets at Disneyland are more than just photos. The characters (when applicable) actually talk & spend a few moments with visitors.
Thor & Cruella can both be hilarious when interacting with guest.
Tip for all you Disney Visa Cardholders at Disneyland and at EPCOT: You can take multiple pictures with Mickey and a couple of other characters (usually Minnie and Goofy) and choose one of the pictures as a 5 x 7 for FREE!
Snow White was speechless.
Meet and greats are primarily for the kids, and therefore if you're taking kids to the parks they are a must (if that's what the kids want). Why bother taking your kids if you're not going to make sure they're going to have the time of their lives.
This year we accidently took a photo with Ariel mistaking her line for the ride line. She was so nice! :D