Pros
If you want to learn how to be professional and how to handle all kinds of situations, you'll definitely learn how to here. Looks good on a resume. Sometimes (on things like major holidays or special days at the resort, like Disneyland's birthday) they'll feed you. Sometimes it's for everyone in the resort or park and sometimes it's a specific department that decided to do something nice for it's cast members. There's also opportunities to win tickets to Disney (and Disney partners) events and activities. Recently there was drawings to win tickets to Disney After Dark hard ticketed events.
Cons
It's really not worth it to work there unless you desperately need a source of income, you're applying for a salaried or specialty position (i.e., a position that requires a degree, certificate or certain experience) or you don't actually need the money and you're just looking for something fun to do. You need a very thick skin to work, something most of the general public doesn't have. You'll have your fellow coworkers, leads, managers and guests trying to bring you down and you can't let any of them step all over you or you're going to have a bad time. They expect so much out of you and give you very little in return. Don't go in expecting that they'll actually care about you.