It's not just the food, although that is excellent.
Chick-fil-A runs a business where the employees are delighted to work there, enthusiastic, clean friendly, helpful to a fault.
They treat you like the are genuinely happy to see you and want everything you experience there to be wonderful.
It's a refreshing service model seldom seen these days.
I've always gotten that impression from In and Out Burger, too. Busting their butts, polite, enthusiastic.