This has been a great thread to read.
Most of my childhood was spent in Destin. I didn't start seriously visiting Walton County until well after college.
But if you think the Grayton area has sustained growth in the last 30-40 years, what about Destin? In the 60's-70's, there were three motels and to my memory, only three restaurants (Blue Room, the Restaurant at Silver Beach Motel/Cottages, and Marler's Diner).
Now it's freaking Miami Beach.
Yup.
Some time ago, I received an e-mail of an aerial shot of Destin that was taken during the movie Dr. Strangelove (I think that was it - much of it was shot at Eglin circa 1950's - early 1960's). It was then enhanced so that if you clicked on it, all of today's stuff would slowly appear. It would make you step back and think, for sure.