Universal's hours are awful. We were just down in Orlando for 2 weeks and spent almost all of our time at Disney instead specifically for that reason. We'd finish working at 5 and the parks would close at 6. We could go to Universal on weekends of course, but the parks are mobbed on the weekends and Express passes are expensive. We usually picked Disney on weekends too since you can spend like $25 at Disney and never wait in a single line all day no matter how busy it is.
There was one random Friday night when studios closed at 6 and Islands closed at 9 and it was awesome! We got to the park like 20 minutes before 6, got in line for Rockit at park close and didn't wait long at all, then went to Islands and had a great time. It's a beautiful park at night and the coasters are all great night rides. I really, really wish they would stay open late more often.