Personally, I thought it was a real snore of a ride... and I am even a fan of Carosel of Progress! We skipped it the past few times we were in the World. I have not been to it since the refirb ... maybe better now with the interactive part. I'll give it another shot next time
We are going in May, and I rented from Netflix "The History Channel's Modern Marvels : Disney World." Our entire family really enjoyed it. From DH to DS (2.5). It gives a really interesting view of the Epcot ball being built, among other things. I really recommend watching it.
We were there last year during the refirb and got to go on it during one of the few times it was being tested before it was completely open full time again.
Since we happened by at the right time we decided to go on in. My 5 year old son LOVED it and kept begging to go back to the Ep"E"cot ball.