Wow. That's a lot of people to please. We've done the multi-family trip before, but only once did we do a Table Service Restaurant in the Park (Ariel's). It took a lot to get everyone to sit down together: wake everyone from their naps, get everyone dressed (especially the cranky toddlers), lode up the cars, park, ride the tram, walk to the gate, walk into the Park, get caught by the Parade, convince the little ones to eat while they could see the rides across the water, etc. We did do a dinner at House of Blues. We did it on a day that we weren't in the Park so it was a much more leisurely paced activity. Bottom line, in the Park, there's so many distractions and competing priorities, meals are difficult large-group activities, especially with children. However, family meals outside the park (DTD or, even better, in town) can be much more enjoyable.