I've never had a problem with Ellen's Energey Adventure either. While it certainly is not my favorite attraction on Disney property, it still is enjoyable, and a great way to cool off on a typical Central Fla summer day. The dino scene is unique and well detailed, Ellen & Bill Nye are entertaining. So it's not a must-do, but still a pretty decent attraction.
As far as worst attraction at WDW: Primeval Whirl at DAK. Simply put, if it's a ride that can easily fit in at a local Six Flags park, it should not be on Disney property. Now if you throw a roof over this eye-sore and theme it better, then we'll talk.
On Universal property: Another vote for the Woody Woodpecker kid zone at USF. That section really has an identity crisis going on: Barney, Woody Woodpecker, Curious George, and...E.T.?? (Okay, E.T. is actually a great attraction & must-do for us, but the rest of that area? Blek)