Disney World never was cheap but for its first 30 years, it was affordable.
For example, the first ticket I ever bought with my own money was a 3-day hopper in May 1983. I paid $35 (tax included) for that 3-day ticket, today’s equivalent of $109. $109 is not cheap but it is affordable for 3 days of entertainment. I was a student and part-time lifeguard making $3.75 per hour. (Minimum wage was $3.35.). Even I could afford a 3-day ticket which, at minimum wage, represented 10.4 hours of work.
Of course people complained about paying today’s equivalent of $109 for a ticket. That’s $436 for a family of four. No matter how you slice it, $436 is a lot of money for many families.
But let’s look at a 3-day ticket today. An equivalent 3-day hopper with tax is $534 or more in July, the month a typical family might go. For Spring break, another popular time for families, it's as high as $609 with tax! At today’s minimum wage, that represents an incredible 84.0 hours of work!
10.4 hours of work versus 84.0 hours of work is a tremendous change in affordability.
WDW never was cheap but it once was much more affordable.