As the PP said, you do see many children when dining at California Grill, so you wouldn't feel awkward bringing them. They have a kids menu and the place is already boisterous enough that kids don't make the atmosphere seem less nice.
If you feel your kids will behave enough to last through a sit-down meal that will go longer than most other TS locations (assuming you order more than 1 course), than I say go for it.
Also, if you can schedule your meal around Wishes, that will help the kids stay occupied.
I think the experience is totally worth it. The food is wonderful, and even without watching Wishes, the view cannot be beat!