Electric Water Parade is the longest running show or parade at WDW we first saw it in 1983 and still love viewing it on each trip.Hayride CM wagon driver told us the info about the EWP.
It runs every night as long as the weather permits.
There's more info about times and stuff on www.allearsnet.com
I don't remember exactly where it was, but I saw it on there just this afternoon.
Just back and watched the parade a few times. It was running a shorter version, I guess some of the floats were damaged during the hurricanes.
My 4 year old loves it and noticed it was short and then rattled off what floats were missing, he was disappointed at first but still loved it and insisted we watch it 3 more times.