The only other river raft ride I've ever been on was the one at Magic Mountain - and that only once. I wasn't impressed at the time. All I really remember of that is the raft going *bump* down these "steps" in the flume. So by comparison to that, at least, GRR seems fantastic!
The drips from the pipes on the way up, the little signs and things, the whistling wind in the caves, the surprise geyser in the water, etc., really add to the theming, even though its not as extensive as Thunder or Splash Mountain. And I think Grizzly Peak itself is a great icon.
It's a little weird, though, that the only animals we see along Grizzly River Run are rats (and then, only their little glowing eyes).
I think the ride could use some "plussing" when the Placemaking finally comes through.
Once, I December, I rode in a raft all alone after dark (most of the other rafts were going out empty, too). That was a unique experience.
I like that it has Single Rider, but the last time I was there I got put in a raft in which every other rider was part of a single family. They were like, "are you sure you're supposed to be in our raft?" or something like that, and I tried to explain the concept of Single Rider. They were friendlier after that, but I think they still wished I wasn't in their raft.
To get dry after GRR, I usually go on Soarin' with those wind effects