Ranking without reading others:
Grand Floridian -- I love the life-size ginger bread house!
Wilderness Lodge -- The huge tree really fits well with the big lobby.
Boardwalk Villas -- I love the chocolate boardwalk display

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Animal Kingdom Lodge -- Big tree, big lobby, nice African theme.
Beach Club -- Almost life-size chocolate merry-go-round that works.
Yacht Club -- Hmmm ... I was there but I don't remember a darn thing! Some chocolate thing-y like BW and BC I think, but not as impressive.
Polynesian -- Not fantastic, I don't remember much.
Contemporary -- I know they do something, but it wasn't impressive.