Walt Disney himself created the Caroussel of Progress for a World's Fair (I want to say 1964, but it may have been '54, or something like that). That reason alone is why many seem to love it - something Walt actually had a say in.
The show follows one man (voiced by the narrator of the movie "A Christmas Story" whose name escapes me right now). You sit in a theater that slowly rotates around the stage (hence 'caroussel'). It rotates, then stops for about 5 minutes for a scene, moving forward in time with each rotation. It starts in the '20s and goes up to the millenium (I think) and you find out about what life was like in each era. Example: In the 20s, they had a handpump to get water from a well, in the 50s, the tv becomes popular, etc.
Personally, I love it, as does our family of mostly adults. It's something I would imagine younger children getting bored with, but it is a wonderful relaxing break. It's quite humorous and has a catchy tune that bridges the gap between the various stages.
I would definitely give it a try if you've never seen it before.
RyMickey