No one has mentioned the Cabins in Ft. Wilderness. The shallow end of the pool is a couple feet deep, but there are lots of younger kids who play on the steps with their parents nearby.
The cabins have a separate bedroom that has a double bed and a set of bunk beds. There is also a murphy bed in the living room. There would also be enough room in the bedroom for a port-a-crib if you had one (although it would be tight).
You don't mention when you are going, but there have been discounts for the Cabins that get the cost to around $150/night (or less). They also have a full kitchen including microwave, full size fridge, stove + oven combo, TV's with built in VCR's in the living room and bedroom, a deck with picnic table and a built in grill.
It's a great place for a family. The kids can be as loud as they want without offending anyone because the cabins are separated by 10-20 yards from each other.
There is also a nightly campfire sing-a-long that Chip and Dale visit, A Disney movie is shown on an outdoor screen at the campfire, a petting farm and many other things that are great for kids. My kids loved catching the lizards around the outside of the cabin.
Sorry to ramble, but my family and I love the Cabins. We have stayed in them 12 times and would continue to stay there except we recently bought into DVC. Take a look on Allearsnet.com. The pictures and descriptions are pretty good.