We ate at H&V earlier this month, and it was our favorite meal all trip. My DD (2.5) loves the Little Einsteins, so she got a kick out of meeting them and participating in the dance party.
When we were there, it was really uncrowded -- the restaurant was maybe 1/3-1/2 full, and it was great! Each character made it around to our table at least twice. We also quite liked the food. Breakfast is pretty basic, but they did have a cheesy potato casserole that was delicious! Our ADR was for 11:20, so we got to try both breakfast and lunch foods. Lunch is definitely better, but I thought the breakfast food was pretty good.