When sartan0 and I went to Disney World, it was his first trip to any Disney park. He was skeptical that he'd enjoy it all that much. By the time we left, he was talking about planning our next trip. XD

I don't remember enough Disneyland details (it's been 15 years since I've been to DL) to help you with your scientific research, but I'm certainly interested in hearing what everybody else has to say.