Last time we went we stayed in Disneyland Hotel and made use of Minnie Club to leave the kids for a couple of hours - we were amazed this wasn't advertised anywhere and wondered if there is anything similar in any other hotels.
Not in any of the other onsite hotels - that I've ever heard of anyway! They all have a small indoor play area, with a TV and colouring stuff, and sometimes there is a CM there too. But sadly, they won't look after your children for two hours!!