My family just got back from a weeklong trip to Florida which included a visit to Disneyworld and The Magic Kingdom specifically. It has changed since I visited in 1978 with my parents and sister. My dad worked for an asphalt manufacturer so he could only take vacations during the "off-season", so we went in February. On the one hand, it was pretty empty, on the other, it was cold and rainy. Back then, "Disneyworld" and "Magic Kindgdom" were synonymous as that's all that was there. I remember being fairly disappointed. Cinderella's castle wasn't a castle at all, but simply a walk-through tunnel. You had to have tickets to ride the rides and each ticket booklet (a vague recollection places the price at $7) had a limited number of "E" tickets which were for the better rides along with the "A" through "D" tickets which didn't offer much of any interest to me. Plus, the one ride (besides "Haunted Mansion") I wanted to ride with my "E" ticket, "20,000 Leagues Under the Sea", broke down while I was in line. I was forced to use the ticket instead on "Space Mountain" which I was deathly afraid of. Riding it on this visit, I realized how tame it is and how much of it is really an illusion of lights and sound.
I found this Guide to Walt Disney World from 1978 at a recent sale. It shows what was offered to my 11-year-old self back then.