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"
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.