I actually live about 20 miles outside of Mount Airy, which is the town Mayberry was based on. There's still an Aunt Bee's resteraunt chain, I think there's still a Floyd's Barber shop, and you can still take a ride in Andy's police car. I'm not sure how much of these are cash ins on the show, or actually just still around from what the show was based on.
I never really liked the show, but I appreciate the impact it has had and the generally moral and family-friendly nature of it, and of Andy Griffith himself. I heard he wanted a low fuss and semi-private funeral, and so he was buried on private land within a few hours of passing. I love the humility that evokes.