There is a sneak that I used extensively this past trip to avoid the I-4 when it was overly congested between 535 and Universal. Take World Dr onto to I-Drive north. Turn left on the new Darryl Carter Pkwy, cross over I-4 and turn right on Palm Pkwy (becomes Turkey Lake Rd). Things still get pretty congested around Sand Lake, I would cross over Sand and cut over to Kirkman on either Vineland (just past USF), or on Conroy (towards Mall at Millenia). I absolutely love this new route, at least until the word gets out about it. A 4-lane overpass with almost zero traffic!
ETA - oops, perhaps the word is out now...