To be fair to Walt, a lot of people, few of them fascists, designed big housing/community projects. The cities were industrializing quickly in Europe and the U.S. in the first half of the century, except during the world wars and the Depression. EPCOT suggests he may have formed his ideas about the future in his relative youth, in the 1930s. (This may also explain why Bill Gates was slow to catch on about the internet. I read "The Road Ahead," and it was obvious he grew up reading science fiction written no later than the '70s. Few science fiction writers predicted personal computers, much less an uncontrolled internet. Most envisioned computing resources as a sort of centralized utility. This might also explain why Bill bought the Bettman Archive (now CORBIS), which essentially comprises our visual memories of the early 20th century.)
EPCOT may owe as much to Le Corbusier and Walter Gropius as it does to Hugo Gernsbach. It doesn't seem to have incorporated any ideas formed later than the 1930s or so.