Pfft. You're good.
There are certainly more residents here every year, both permanent and seasonal, and traffic has of course increased along with the population. But I've personally never been in what I would even remotely call a traffic jam, with traffic at a standstill. Even during rush hour on 441, it's rare to have to wait through more than one light to turn left, and that's one of the busiest roads around.
Publix and other stores are noticeably more crowded during the winter, which in reality means nothing morethan parking 5-6 spots farther away from the door.
The Wal-Marts are the busiest stores, in my experience, but that's everywhere I've ever lived.