It's been mentioned that the windows on the second floor of Main Street buildings show the names of Disney VIPs. Walt Disney's name is printed above the Plaza Pavillion Restaurant/Main St. Bakery area and faces Cinderella's Castle. This is so that Walt is always looking at the castle, so to speak.
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In the title sequence for most movies the director's name is listed first and again at the end of the credits.
The windows on Main St. while paying tribute to certain Disney employees are also the "credits" for the creation of the park.
The very first window on Main Street visible from outside the park designates him as "Chief Engineer" for the Walt Disney Railroad.
The window over the Plaza Restaurant shows "Walt Disney, Master Classes in Design and Master Planning"
These two windows bookend all the credits inbetween, just like in a movie.
pg. 26 of the Imagineering Field Guide to the Magic Kingdom