Disneyland is not regarded fondly by the architecture and design community at large with it's faux castles, jungles and streets and oversized rubber-headed rodents gallivanting about. But there is no denying the genius of the planning concepts and methods pioneered and honed by Walt Disney and his "Imagineers" and the impacts that their work has had not only on American and international cultures, but also on the design professions.
At Disneyland, designers created the first physical space conceptualized as an interactive experience using cinemagraphic story telling devices to choreograph the free movements of visitors through a three dimensional fantasy movie. Sequences of spaces and transitions were carefully planned to combine disparate elements into a cohesive whole.
An article in the LA Times talks a bit about the influence of the park on everyday places such as malls and revived downtowns, "lifestyle centers" and other places where the distinction between fantasy and reality has been blurred beyond the gated and bermed Magic Kingdom.
Article: LA Times - A Park With a Powerful Spell
Link: Wikipedia - Disneyland
Link: Disney corporate history - Disneyland
Link: Disneyland Beginnings