Agreed. Having worked at Both Busch Gardens parks and Universal, everyone normally loves it and they love the parks, however they may not come off that way at certain times if you catch them at the wrong time.
As much as working in a theme park sounds like great fun, it is really just another job at the end of the day. Going to the parks everyday... you get used to it and frankly tired of it. So on your days off, it's not necessarily a place you want to go to hang out.
But from my experience, most employees do have a genuine love for the parks, especially at Uni.