Buildings at WDW don't exist in a vacuum. Their visual and spatial relation to each other is critical in establishing each's setting and purpose and upholding the overall harmony of their surroundings.
It doesn't matter what the building is used for, or who uses it, visitors can see them from many angles and having wildly different architecture and mass so close to each other goes against the meticulous look of the resort.
Sightlines are important outside of the park too. That's why Walt bought all that land to begin with, to control the total environment, not just own the buildings on it.