VERY rarely.
I enjoy a McDonald's Big Mac on occasion, A&W Bacon cheeseburger (as an excuse to get a root beer), and Wendy's Biggie Bag with 1/4 cheeseburger and chicken nuggets for $6. Sometimes, I'll get a sandwich from Subway or Jimmy John's, but I haven't had one of those since last Fall.
Most everything else is just crap. If I am going to eat out, I prefer to go to a sit-down restaurant.