My favorite is still Animal Kingdom Lodge - being able to sit at the fireplace, look out the massive windows at the beautiful view, sit in the club-room alcove, soak in the ambiance / excellent background music - I just love it there.
I also love Grand Floridian, but that's 90% because of the Grand Floridian Society Orchestra, 5% for the grand piano when the orchestra is not playing, and only 5% for the faux old-world opulence (not denying that it's pretty though). Poly is great too - I'll often head over there just for a break from the parks ...