From WHR, take Old Lake Wilson Road north, to US-192 east, to I-4 East, 10-15 minutes, follow the various signs/exits on I-4 for Seaworld, Wet N Wild, Universal. I drove it every day last week as I was attending a conference at the Orange County Convention Center (right by Seaworld), even in morning rush hour I made it in 20 mins no problem at all.
Orlando rush hour really isn't that bad...compared to Chicago where I live, it's heavenly!