Anyone who goes to both Universal and Disney and does not see a difference is just not paying attention, I have seen it many times.
At the Horror show they come right and say it in there skit "We don't have to be nice to you we are not Disney."
I have seen the workers at the cafeteria style restaurants yell at customers at least twice.
At the Shrek show they are extremly rude, I know some is part of the show but if you ask them a question you will get a really smart answer, I don't ever ask them anything anymore.
It was raining one day and at MIB this woman was screaming at people to take their ponchos off and if they don't they won't be getting on the ride.
Another time it was raining and I asked a worker at MIB if they would be having the Bettlejuice show and she said she never heard of it.
We rode the simpsons ride and this guy had claustophobia and jumped out of the car while it was moving, he started banging on the walls to be let out, we sat there for 10 minutes and nobody came in to see if we were ok, finally a mechanic came in to reset the ride.
A few minutes after that a worker finally came and told us to get back in line to get on the next ride, she acted like nothing ever happened, Hello this guy just jumped out of our car and freaked everyone out, don't you have anything to say!
I will say if you show your FOTL pass you get much better treatment, and at the hotel they are fantastic.
I love FOTL and really like the rides but I just expect really poor treatment at the park, I can put up with it for 2 days.
When I go to WDW my expections are really high for great service and I would never put up with any poor service.