My favorite interaction was at 1900 Park Fare as well, but at dinner with the step-sisters (this was about 6 years ago now, so maybe less recent than the last time you went).
One of the stepsisters asked me where I met my prince, so I went into the store about how we met watching for a tornado. She screamed, "IN A TORNADO" and the whole dining room stopped for a minute. She then informed me that she wasn't willing to try my way of meeting a prince.
Belle was super sweet with DS when he was 2 years old. She compared him to her "friend Chip" then gave him a lipstick kiss on the cheek.
Vidia (one of the Tinkerbell Fairies) stayed in character really well with him too, and kept asking why he wanted to give her a hug.
Our interaction with the "fuzzy" characters hasn't been as good, but Donald Duck grabbed DS during a photo op and wouldn't let go until after we finished the interaction.