Honestly Disney makes travel with large groups pretty easy. We did have a few meals together and I didn't have a problem securing reservations for all 12 of us. One of those meals included our traditional meal at Chef Mickey's:
Touring the parks with the younger kids was really not that challenging. Sure there were rides that they could not ride but we either took advantage of Disney's Child Swap or one person (usually me) stayed behind with the kids while the others did the riding of the ride. There was also time for the little kids to pose for photos:
Overall we didn't find it a challenge to visit the parks with our larger group. This upcoming June trip we hope to have all of this family back with us again for our trip...and maybe even a few extra people that were not there for the January 2006 trip. We are looking forward to it!