Wow, the first and only time I ever visited Walt Disney World was in 1973, and this article brings back a lot of memories of our family road trip from Chesapeake, Virginia down to Florida. We had moved to Virginia in early 1969 after living in San Diego for nearly eight years, from where we'd make yearly forays north to Disneyland.
We were looking forward to our trip to Disney World, and I remember we were all impressed by the scope of the place, and the hotels (both of them) all connected to the park (yes, only one) by the monorail. We stayed at the Contemporary, in one of the suites outside the main A frame, and had a great time playing in the water as well as visiting the Magic Kingdom.
I do remember being very disappointed by the lack of detail in the magic Kingdom itself -- sure it was much much larger than Disneyland, but it felt almost vacant, with much of the space under utilized, and the attractions less themed than what we were used to at Disneyland (Pirates especially disappointed me). Apparently the rest of my family felt the same, and we never returned, despite living in the general area until 1986.
But then the rest of our "trip of '73" was almost a replay of National Lampoon's Vacation, except that our Wally World was actually open, and so nobody punched a moose.