Agree, for you things will be great.
South Florida is on Spring Break. I almost booked a trip up, then remembered the power passes are blacked out, oh well.
The advantage to going during this busy time, is the parks stay open until 10pm, and they may have fireworks. The plan of attack, is to show up early for front seat rides on the coasters, get all the rides done, then go back to the hotel in the afternoon to rest and hang out at the pool. Around 5pm, go back to the parks for the evening, you'll see the masses leaving the park tired out. You basically want to avoid the parks from the hours of noon to 4pm, that's rush hour. You may have FOTL, but you'll notice tons of people in the walk ways, and you'll get tired of dodging them.