What is written about GACs (Guest Assistance Cards) in the disABILITIES FAQs thread was about WDW, but it works the same in DL. One of the differences is that since DL is an older and smaller park, they have less places for people to wait. You would still go to Guest Services in DL and request a GAC. Then, ask the CM greeter at each attraction what to do.
Universal in Florida works pretty much the same as WDW, but Universal is a newer park and actually has some waiting rooms specifically for people with special needs. No one has ever written about Universal Hollywood, so I can't help you with that.