I saw people in the queue for the next CP show back in November, and that show was a couple of hours away!
What we did was to listen to some of the music from outside the amphitheater seating area in the American pavilion. In some areas, you can see the stage from a distance.
IMHO, I personally don't see the attraction, but I know that people love it. CP does seem to bump up attendance in Epcot - my wife overheard several people on our last trip say the only reason they came to Epcot was to see CP.