I really think that you'll enjoy GG. The fact that it's family style makes it more appealing for me as I do not care for buffet very much. However, IMHO GG has the best character interaction. We've done this twice now, and chip and Dale are awesome! The first time (2007) chip tried to "eat" DD6's mac and cheese. The 2nd time (in Oct 2011) we had a late seating and the resturant was virtually empty. Every time the characters circle the resturant they stopped by our table. (Prob 5 or 6 times). DD9 had a blast talking, and dancing with them and there was no rush!
While we enjoy Chef Mickey's breakfast,we felt rushed with Mickey and the gang. If you want Mickey @ dinner this is the one I'd choose.