My family does eat out a lot, so we're not a good example. However, we have family friends who rarely eat fast food.
There's also a great deal varriance in the kind of fast food people our consuming. In California, designer fast food chains are popular (build your own sandwich [Jersey Mikes, Firehouse Subs, Jimmy Johns], build your own burritos [Chipotle], build your own pizza [Blaze Pizza, Pieology, MOD Pizza], etc.). Of course, burger chains, fried chicken chains, and more ominbus chains are popular too.