I thought I read somewhere that Universal does have a similar system as WDW. However they are much newer=much more ADA compliant. I personally didn't get the GAC the
ecv is enough at WDW, unledd you have additional problems, like not being able to be in the sun, crown problems etc...
Speaking of crowds they were very managable and on some days non existant. THe only exception was MK Sat night as that was the only day that week they were showing SPectro and fireworks. I spent all of 5 minutes in there before Iheaded out to Ohanas for my dinner Ps and watched the Fireworks from airconditioned peace and wuiet.
This was my experience:
Thur. pm: MGM, only real crowds I saw were at the B&B show immediatley folowing the parade. I think everyone decided to go to this showing. Fantasmic was also SRO
Fri: MK crowds easily manageable with use of Fast Pass.I even walked on to SWSA at 10am or so.
Sat: Epcot: No crowds at all. Walked on to TT woth 10 min wait (they hadn't even opened the FP machines yet. But I did go there first. The only line I noticed was at Maelstron that afternoon. FP return time 45+minutes. I didn't check back at TT but I am sure it was similar there as well. I zipped around all the countries in record time. I didn't stay for the parade or Illuminations, as I had been on an Illuminations cruise the night before.
Sun: Disney Quest no crowds at all. It was mothers day and I guess its not real popular with Moms. No more than a 5 minute wait for anything there.
Mon: AK. Again no crowds. I headed straight for the safari (Iwas walking this day) and walked right on. Same for Kali (rode 3x in a row) and Dinosaur. Chester and Hesters was SO tacky and there were lines for these rides (go figure). Also minimal wait for ITTBAB. Got a great spot for parade in front of Tusker House and saw the parade coming and going

took some nice pics.
www.geocities.com/eeyorefanaticus/mjjp.html
Left on Tuesday after breif stop at MK which was deserted!
Hope this helps