I work in the tourism office at a very pet-friendly town and am really surprised to see the outrage here. I am allergic to dogs myself, and am pretty germaphobic if we're going to go there, but I also recognize that this is a growing trend in the travel industry and for that reason it isn't completely outlandish that a resort complex as large as Disney would offer this.
The accommodations I work with in town include 4 pet-friendly options out of 11 total hotels/inns/B&Bs. One of the hotels in town is by far our most popular place for guests to stay, and in addition to being pet-friendly they even have a doggy room service menu. The same rules that Disney is using with allowing dogs to be alone in rooms for 7 hours, limiting the number to two dogs, and providing specific signage for the door are really standard across the travel industry.
Many chain hotels allow pets, and if you didn't know that it's probably because you weren't looking for it. I stay in chain hotels traveling for work all the time that I know are pet friendly, but since I didn't bring a pet it really has no impact on my stay, and even with my severe dog allergies I notice no difference. I probably get 1-2 inquiries per week at work from guests who are looking for pet friendly accomodations, which is a lot given how small the town is. I don't think Disney is trying to ruffle feathers with non-dog owning guests, I really think they're just keeping up with what many other resorts in the industry are doing and it's causing people to overreact.