The cycle goes something like this:
Disney's biggest customer base is middle- to upper-middle class families. Thus, middle- and upper-middle class kids are the ones who are the biggest fans of the Disney Parks. Thus, young adults from middle- and upper-middle class families are the ones moving to Orlando to work for the Mouse. But these people are used to middle- and upper-middle class lifestyles but they have entry-level or working-class skills. Thus, their wages don't support their lifestyle because their lifestyle is based on their parents' income, not their own. So the WDW cast members complain that they're underpaid even though most of them aren't doing anything more difficult than what you'd do at McDonald's or Burger King.
You're describing a tiny minority of WDW cast members. The vast majority are not Jungle Cruise skippers of people who speak freaking Na'vi. Most of them sell you t-shirts, just like your hypothetical Kohls worker, or hamburgers, just like a hypothetical McDonald's worker, or clean hotel rooms, just like a hypothetical Hilton worker. There's nothing wrong with these jobs, but the idea that cast members are "special" compared to workers in similar roles at other companies is a fantasy.