I visit Orlando 3 times a year for 2 weeks at a time...every time I come i get the unlimited Disney/Universal/Sea world/Busch Gardens package....I always split my days 6 days Disney 5 Days Universal, 1 day Sea World, 1 Day Busch.
Out of all the Parks, coming from a middle aged man, My favourite park is IOA(Hollywood Studios a very close second) and my least favourite is MK. That is because MK is mainly catered for young children and toddlers. There's hardly anything there for me. Take today..We started in AK, completed that park by 11am..had lunch and then head for an aftwenoon at Epcot (Did GGCR twice)..then head to HS till 9pm close and we were about to head to MK to take advantage of the late opening, but we just didn't think there was anything worth travelling over for, so went back to our hotel. Yeah the fireworks are great, but for us there's just not enough to do for adults.
So for me...it has to be IOA. Velocicoaster is my favourite thrill coaster in the world and Hagrids is my favourite all round themed ride in Orlando.