Gretchen, I have one of those devil-children, too. My guy is 4yo and has been removed from restaurants, stores, etc. Restaurants are the bigger problem since I don't want him, or any child, to ruin the experience for others. I figure that nobody is going to the grocery store for a good time so I tolerate more there than other places. That, and we do need groceries.
Today he had to have a 10 minute time-out in his room after we returned from the grocery store because he was yelling everything that he had to say to me, even though he wasn't always mad. ARG! He got a fair warning and then I followed through with what I'd told him.
I don't expect perfect behavior from my children or other's children, but children should be taught what respectable behavior is.
As to the Sounds Dangerous show at MGM, I had a problem there when my son was 1yo. I knew that he wouldn't have a problem with the dark so we went. He started making baby noises (not crying, etc, just noises, but you know how the sound carries in that show) and a lady in back of us started making all sorts of rude comments about him. The ironic thing is that didn't she realize that she could be heard by everyone, too, and she kept it up, not just complaining about Jake, but just talking. She was an example of a rude adult... I wanted to take Jake out, but it was pitch black and we weren't on an aisle, so I had a hard time doing so. Yes, they warned us about the darkness, so I should have known, but was thinking more about the scary factor the darkness, not how hard it would be to leave. Live and learn, which I do.
Someone mentioned the age to bring children to WDW. We waited until our older children were 4, 7, and 10 yo, which was perfect. Problem is, we had a 4th child. We took a second trip when the kids were 1, 7, 10, and 13. I wouldn't have normally brought a 1yo, but with other older siblings it was the right thing to do. It also depends if you are talking about a once in a lifetime type trip or something that occurs on a somewhat regular basis. Not to mention the temperment of the child/children. All individual and personal decisions.
My husband and I hope to take a trip to WDW, sans children, and hopefully I won't be surrounded by too amny unruly children, but even if I am, my consolation is that they are not MY unrully children.
T&B