Ok so, a couple of points here.. my dog lived “downtown” in a condo with me after living in a relatively quiet home. He did fine. He also traveled with me from 16 weeks of age. He has been exposed to a lot in his life. Fireworks, traffic, loud music, car horns, train sounds, boat horns constantly as we always lived near the water. All of the ‘beach city’ noises. We lived in South Florida, so the “heat” is a given. I always made sure to have water on hand, as did all of the restaurants who allow dogs in their outdoor areas.
We live a few minutes away from an amusement park now.. they have nightly fireworks all summer long. Doesn’t bother my dog in the slightest.
It’s important to remember that all people are different, and all dogs are different as well as exposed to different things. Just because one person’s dog may stay at home all or most of the time, doesn’t mean that another person’s dog isn’t out and about regularly. Same with reactions to loud noises etc.
I personally would not bring my dog to Disney World. I have brought him to a dog day at our local amusement park during a Halloween event, he loves it.
Maybe someone doesn’t spend a lot of time at the parks and enjoys having their dog with them at WDW? Again, it’s too restrictive for me, and my days are too long.. but I can’t assume that everyone does a Disney vacay the same way that I do.