I'm torn between having more hours to experience the park and an easier time with the traffic getting there from Anaheim (Sun), or slightly smaller queues but worse traffic (Fri).
As a Disney veteran, 7.5 hrs does not sound like a very long day to get my money's worth...
Walt Disney World's Magic Kingdom
Disney's Animal Kingdom
Disney's Hollywood Studios
Disney California Adventure
Universal's Islands of Adventure
Universal Studios Florida
Universal Studios Hollywood