I don't know, I've planned trips to many, many countries, including over a month-long African safari across the continent. Disney's a piece of cake in comparison to most big trips people take because there is so much info online. All Disney trips really require are for one to:
1. Pick a park. If one wants to move around on PH, then fine, but a good % of visitors pick a single park. Each park's hours are posted within the timeframe for steps 2&3.
2. Book restaurant times in the park that you want for each day if that's important to you. This is no different from making reservations anywhere else in the world. This is not required - there are plenty of QS options.
3. Book FP+ for the rides you most want to ride each day. Again, plenty of info including video POVs for all the rides. Also not required. This is just for FP+ to cut down on wait times. Standing in line is always an option.
It's not that hard.
Now rate that person's resulting experience vs a person who
- Knew which park to be at to avoid the crowds for that day
- Knew a touring pattern to avoid the worse lines
- Knew that to actually see that show you saw in the times guide you better be there 45mins early to get a good spot
- Knew that if you didn't want to eat off a tray you had better make reservations well in advance
- Knew that if you'd want to have these MDE profiles set up on your devices if you wanted the same info access everyone else has
- Knew which park really should be 1 vs multiple days
- Knew what things outside of the main parks were worthy detours
- Actually knew which food venues didn't suck
- Had the details to know actual costs to budget for
- Knew things like resort delivery was a thing
- Knew things like 'what transportation option should I take'
- Knew things like 'mickey doesn't just show up like you saw in photos.. you have to go and wait in line at town hall to see him'
Yes, you can just buy a ticket and goto WDW... but your experience would be a fraction of what it should be because you're behind so many others who did put in the time and you suffer at their expense.