My wife and I rode Winnie the Pooh on our last trip. I have to say, I did not hate it. It was a nice little ride. I completely agree, it is a lot better than Frozen. It goes through some of the more memorable scenes of Winnie the Pooh. Like you said, Frozen is just the song with random scenes.While it is really character driven, Pooh ride does at least play around with environment and experiences a little more in the middle with "Getting to bounce with Tigger", the Heffalumps and Woozles trip-out, and floating during the flood.
Frozen doesn't even manage to do that, it's just "Let It Go's a real popular song, let's hear of it fifty times more"