I loved the Disneyland hotel, but have only been there and couldn't comment on the others!
Rooms not huge, but comfortable. Small bathroom, but adequate for a family of 4.
The usual you would expect from a 5 star hotel; room service, turn down service with chocs on pillow, free toiletries (MM of course). Character meals are fun for kids, and loads of characters in the hotel for photos.
There is a kids club if adults want some kid-free time (like a nursery or playgroup), a good souvenir/ gift shop, a health club but the pool is TINY, and not suitable for small kids, as it is deep, and doesn't have a shallow end. There were armbands/ floats for kids, but they would need close supervision. We went in March, and there was no early entry to the Parks, but we did get three fastpasses per guest- don't know if they do that at other hotels.