You still aren't getting it.
First of all, my entire adult life has been spent in a career of Sales and Finance, so I am well aware of different tactics to make people part with their money.
The whole Disney Fanatic thing- No, I have never experienced the situation you described. Disney World is not and will never be my family's only annual travel destination. It wasn't for me when I was a kid either. The majority of my friends and family go to WDW annually, they also go other places as well. Travel and experiences are important to me. My parents instilled that in me as a child and it has only blossomed with time. I try to surround myself with people who feel/do the same.
Our June '17 Alaska/Olympic Peninsula trip has an overall cost of almost double of what we are spending on our upcoming WDW trip, so yes, WDW is expensive, but so are plenty of other places.
If we want to say "brainwashed" then I admit I have brainwashed myself when it comes to experiencing life, and I am brainwashing my child. It's why I have memberships/annual passes to the Zoo, Museums, Amusement park, Aquarium etc. It's why I went tent camping for the first time in 2015, and decided to make it an annual tradition. It's why we find road trips to take within a few hour drive and explore caves while staying in a cabin in the woods. It's why on my son's 4th Birthday I subscribed to a program called "Little Passports" (brilliant website and material btw) and gave him an interactive globe to go along with it. He picks a geographical area, we go get books on it, learn about it, and decide if it's a place we would like to travel to. (His top pick would be Antarctica and I've vetoed that lol).
I will spend money to have those experiences and for my child to have experiences. Maybe it's an inexpensive camping trip or a WDW vacation, snorkeling at Dry Tortugas, or taking a helicopter and dog sledding on a glacier. My emotion and perception of value is what influences me to purchase something. All of these places are competing for our money, all are trying to entice us.
In the end we choose what we do and why. Are we influenced? Of course. I've never disputed that. Look at Disney's marketing, look at how Atlantis markets their resort now, they are aimed at children, to get your child to ask you to go. They know that for a lot of us our decisions are made based on what our children want.