Frozen is probably the #1 ride at EPCOT, or at least it was the last couple of times I was there. It had the longest waits and nothing else was even close -- the wait was 30-45 minutes longer than for Test Track or Soarin'. Ratatouille will probably surpass it now, though, as the new thing.
I also think you're way off base with your last sentence. People who have been going to Disney for years go for those rides, but they are not big draws for any new visitors and probably haven't been for 20+ years, even though the rides you mentioned (along with Haunted Mansion, Pirates, Spaceship Earth, etc.) are among the best rides Disney offers.
While I was specifically talking about rides and not overall visits, I still think you're slightly off there. HP is definitely the biggest draw, but there are a ton of people going to UOR for Velocicoaster now and the IP is really not a factor for that ride.