"... and they routinely sacrificed personal time and freedoms to help make your experience in the parks what it was". Never do this unless its a startup you own. You get paid for X to do Y hours and nothing more. Anything more is volunteer work for a for-profit employer.
That's a pretty cynical attitude. It's definitely possible to work for a for-profit company and still care personally about the success of whatever they are doing. You don't have a moral obligation to bend over backwards for a company, but it's ok to be committed for reasons other than a paycheck.
It is certainly possible, and usually very much appreciated (sometimes even rewarded) in the short term.
Just don't expect it to make much difference to how you are treated over the longer term. The company won't forget that you are an employee and you shouldn't either. Heck, a company with shareholders is practically legally obliged to screw you over if it is better for the company to do so than not.