Hands down my vote goes to Play 'N Dine at Hollywood and Vine.
I've done many of them with my DS and that was the one where I saw him the happiest.
He got to get up and dance with other kids his age with Little Einsteins and JoJo and Goliath and they came to our table as well during our meal. Excellent character interaction.
As a point of reference we've done the following (and they are ranked accordingly).
1. Play 'N Dine
2. Crystal Palace
3. Goofy's Liberate Your Appetite Dinner at Liberty Tree Tavern.
4. Ohana Breakfast
5. Hoop De Doo Review (not characters but DS3 loved it).
6. Donald's Breakfastasouras (now Breakfast Safari-assuming its the same)
7. Chef Mickey's Dinner - not overly impressed with character interaction (waive napkins every half hour
yea!!) Maybe breakfast is better?
I left out Cinderella's Royal Table because you weren't impressed. I probably would have it ranked between 3 and 4. I LOVE their cream cheese french toast (or what ever that delicious concoction was), but it is pricey for what you get and DS while he likes the princesses (especially Jasmine
which I certainly can't fault him for although I'm more an Ariel fan
) likes Pooh and Mickey a little better right now.