One of the things that sometimes happens is a group of people will start speaking along with the Haunted Mansion in the elevator or the safety spiel in Thunder Mountain. Now, I'm sure this is probably a divided issue, but to me when guests start repeating the narration it gets very annoying. Admittedly, I can definitely understand why people do it (it is pretty catchy after all) and most of them probably don't realize how annoying it is. I've seen everything tons of times before so it's not THAT big of a deal to me, but what about the people who have never seen Disneyland before who have never heard the narration and want to hear it for themselves, not someone else's voice.
I'm all for people enjoying themselves at Disneyland, of course. But I think people have to realize that there are people at Disneyland who have never experienced it before and want to enjoy it for themselves. You know, I don't even mind if people simply repeat the narration/spiels to themselves. But most of them belt it out so the entire group can hear.