Champions Gate is a nice area, as long as you don't need to go anywhere. I have to drive through that area every day and the traffic is nothing less than horrific. Traffic backs up for mile and miles every morning heading east and heading west at night is absolutely stupid. Champions Gate is a bottle neck and the exits back up Interstate 4 for miles on end every day. And it isn't just rush hour, it is a good part of the day. And it is not just the interstate, it is the central area where the stores are as well. I now go to work an hour early every day just to be able to drive 20 miles (15 of it on the interstate) in under an hour. Driving home, 1 hour minimum. And don't try to go anywhere on a Friday after 1pm.
Now as another poster said - the entire area is getting very congested, and the infrastructure is not keeping up, but the Champions Gate area seems to be the worst - they have added thousand of apartments and houses with no regard to how to move the people around.
This is just my personal experience, thought you should know. From my driving around, I will say Clermont are on US 27 (between 192 and 50) while growing by leaps and bounds too seems to be a little bit less congested.