Below is a post I did in February after a weekend trip (Friday-Sunday). If you go more days and use FP and EMH, you could fit in more than we did. Have fun!
Just back - All 4 parks in less than 48 hours! Any questions?
Still having a hard time believing we hit all 4 parks between 5:30pm Friday and 2pm today, but we did it! The original plan was to only do 2 parks - Epcot and DHS, but our weekend morphed into a trip around the World instead. Here's how we did it:
Friday
Arrived at Epcot 5:45pm
Coral Reef 6:30 ADR
Illuminations at 9pm
EMH 9pm-12am (did Soarin', Mission:Space, TT, Nemo & Turtle Talk)
Saturday
Arrived at DHS for EMH 8-9am.
Before lunch - TSM twice, ToT, RRC, watched street performers
Lunch at 50's PT at 11am (walk-in)
After lunch - Star Tours, Honey I Shrunk the Kids Playground, Shopping
Depart DHS at 2:30pm
Arrived MK at 3pm
Did PotC, Buzz, SF Treehouse, HM
Dinner at Columbia Harbor House
Dole Whip Break (yummm)
Philharmagic
Wishes at 8pm
Spectro Parade at 9pm
Shopping till close
Sunday
Arrived at AK 9:30am
Did Dino, KS, EE, It's Tough to be a Bug
Bird-watching, shopping, etc
Departed AK at 1:45pm
We stayed off-site at DTD Hilton and drove our own car to the parks. The wait times were low enough that we could have done more rides at the parks, but we felt like taking our time browsing shops.