Ones I pass are not only packed each time but the traffic to get to them comes down on the exit ramps. I've never seen one without traffic.
When we have stopped we never easily got a parking spot. A couple times we had to park behind the building and sadly they only have doors on three sides. Often seen folks leave their car at pump and go in for lack of parking ....
My comment was to the person who asked why no seating to eat ~ because they want you to leave. If I'm going to eat in my car I might as well start driving too. And that opens a spot for the next shopper. No tables or picnic tables is smart for turnover.