I've stayed at all of them except Saratoga Springs and Pop Century. (okay, also not Swan/Dolphin, but I don't count those.)
My favorite is Animal Kingdom Lodge. They could take the animals out and I'd still love it...I can see animals at the zoo and don't care about that at all. It isn't the kind of place for everyone, but if you think you'll like it, you'll probably love it. I like that African stuff a lot and the minute I walk through the doors I just feel so relaxed - all that darkness is soothing.
After that:
Beach Club - very bright and happy. Love the furniture in the rooms.
Polynesian - ON THE MONORAIL!!! and is very pretty and well themed.
Grand Floridian - ON THE MONORAIL!!! and is very nice in a calm kind of way
Wilderness Lodge - Love the music, love the restaurant, similar to AKL in lobby, but less relaxing, IMO.
Old Key West - very laid back, love to sit on the patio at Good's To Go day or night
I don't like Boardwalk. I despise the Contemporary. Rather stay at mods than either of them and that's the truth.
Mods:
CSR - lovely, but hate the fee for the food court
CBR - adorable and very colorful
POR/POFQ - don't care for the themes at those, but they're good enough - if you like the theme, you're all set.