I also think you are comparing a bit of apples and oranges. If you are comparing a self-organized trip across multiple INDEPENDENT activities to a trip to a destination ran as a single unified entity. Yes, your comment makes sense to me. But it's also not a statement to justify WDW's complexity... it just means if you self-organize a trip over multiple places it takes effort. Compare WDW to other self-contained experiences like an all-inclusive resort, or a destination resort, etc which is more akin to a 1:1 and it stands out again.
If you want to travel elsewhere and have a unified experience, you can certainly travel as part of an organized program that takes all that self-organization out of the mix.. and then it operates more like a cruise where someone has sorted all the itinerary and sourcing for you. Yes, not everyone travels this way.. but I also don't think it's fair to knock those places down when it's HOW you are traveling, not where, that creates that situation.
TLDR - I think you're comparing more HOW you travel not really equating WDW travel anxiety to other vacations.
I'm going on a Disney cruise for NYE... 7 days... huge expense. My decision process involved
- Do I want to pay to ensure the specific type of room I want
- Learning what day I can make excursion bookings
- Spending an hour going through the options to decide with my wife which we wanted to do, see which were available, and picking them on the website.
I spent a total of about 2hrs to pick my dates/locations.. and about 2hrs to pick my excursions. Total. I still have to book airfare, but that's about the same for anything. I'll have nothing to deal with except weather going forward. And if I have a problem, there is a human willing to talk to me face to face about it on the ship.
That is easy... WDW jenga is not.