My cousin just got married and went to Orlando for their honeymoon. They stayed 3 nights, 4 days and had been planning on going to Sea World, DisneyWorld and Universal Studios, and the 4th day, just drive around Orlando and hanging out til their flight. I think they ended up only going to Sea World and Universal Studios, and I know they didn't even go to Disneyworld; all that to say, the prices are so steep to get into any one theme park that if you're going to go, you need to make the most of each one place.
People recommend spending a day at each one you go to, and I would have to agree, but also remember that FL is SOO hot that you should definately factor that into your plans, and know that after your first day at a theme park, the next day you're probably going to sleep in, and be sunburned, and you and whoever is going with you will be grumpy. If you can, it might be good to take a half-day every-other day at the theme parks. Like, go to the ones you REALLY want to see every other day, and then on the off-days, just go later in the morning, or at noon, to the places you don't really care too much for.
Just remember to drink LOTS of Gatorade and Water, and WEAR your sunscreen!!! ...And a hat... Hats are good!
And of course, whatever you end up doing, have fun!
I used to live in FL and have had many opportunities for theme parks, sunburns, and attitudes. :p