Animail Kingdom Lodge has a wonderful atmosphere! Two great pools with slides and hot tubs, pool bar, overlooks to see the animals, cultural activities, etc, Love it!
We also really liked Saratoga Springs last year way more than we expected. The rooms are all refurbished, two main pools with slides and pool bars, renting bikes, easy to walk to Disney Springs (especially if you upgrade to Congress Park area).
I guess technically not completely Disney but we stayed at Four Seasons last year for a week and it was hands down the nicest place I have ever been. Made all other Disney properties look bad. You have basically a mini water park to yourself, free kids club, adults only pool. tons of eating options, can see MK and Epcot fireworks, and the service was bananas. Of course the price is insane, but found a deal and paid less to stay there over July 4 week than we would have paid to stay at Poly or GF