And how was a first-time visitor to the parks in 1989 supposed to know to buy Birnbaums and not the "Official Guide," (like we did), which made every attraction sound like a must-do?
I grew up going to Disneyland. So when I visited WDW for the first time as a middle-schooler, I thought I knew what I was doing. I did not. Even back then, there were a lot of little things that required extra insight––ADRs (back then, we never needed them at DL), the resort bus system had a bunch of flags to decipher, we could not find a place that served breakfast, and it was really difficult to even get a sense of what all the options were for things to do during days not spent at the parks (we didn't know you could visit other resorts–let alone "pool hop")!
Again, if you grew up going to WDW pre-internet, I'm sure it didn't feel overwhelming. But it did to us, and we were huge parks fans.
My point is that "navigating WDW is too complicated" is not a new problem introduced by MDE.