I don't think it's an insult to call HE a "train ride with a show". While I think the overall experience will be amazing (the stations, the platform, the enormous scale of everything, the cabin itself), I don't consider it to be a "ride" on the same level as FJ or Gringott's. As a huge HP fan, I still think of it as the mode of transportation that links the 2 lands into a single experience. Most likely when I go on it, it will be at a time when I am planning to go to the other park anyways. But what an incredible way to get there! Kind of like how non-Potter fans wouldn't wait in a long line for Ollivander's, it might just not be as special to them...