Very few people who visit WDW leave disappointed. However, there are also very few people who leave having taken notice of the real magic that surrounds them every step through the experience. When Walt Disney created Disneyland, he found himself disappointed by the area surrounding the park that was a constant reminder to guests of the "real world". When he started purchasing land in Florida for his new endeavor he did so with the idea that everything a guest encountered would lend toward an experience of being transported to a different world. This goal has remained a constant in the vision for the parks to this day. And it is an effort that truly separates the experience at WDW from other theme and amusement parks.
Disney's Animal Kingdom is one of my favorite places to see this attention to detail. Everything you look at, hear, smell or touch communicates that you are in a place that has been there for a very long time. One small example is shown in the photo with this post. Notice how the signage doesn't look shiny and new but instead looks like it's been directing travelers for a hundred years or more.