OK, I'll wade in here...First of all I like Universal Studios. They have some great attractions. Shrek, Terminator, Men in Black, Back to the future, Twister, Earthquake and more. IOA is a waste of time for adults. Unless, of course, you are into carnival like thrill rides. Spiderman is the only one, in my opinion, worthy of the walk. The rest is a long, hot walk, into a mostly "child" oriented setup. Good, but not my cup of tea. If a one day park hopper were not available there I would never go into IOA.
Epcot is quite different than what you remember from 1990. There has been the upgrade of Universe of Energy, Mission Space (you don't get much higher tech than that), Test Track, Sourin', and Illuminations is not to be missed.
MK may be for children, as you say, but at 57 years old I still love it. Space Mountain is the same but there is splash mtn, Thunder Mtn., Classics like P of C, Haunted Mansion, Jungle Cruise, Stitch's Adventure, Philharmagic and on and on.
Disney Studios has added Tower of Terror and Rockin Roller Coaster plus the classics of Indiana Jones, Star Tours, and the Muppets.
Then there is Animal Kingdom that really is hard to describe. You must experience it to appreciate it.
We, of course, cannot make up your mind for you but at least don't measure WDW by what existed in 1990.
