This is definitely a thing. Fast food restaurants used to have a significant number of people eating inside, but now their dining rooms are often empty, to the point that they've taken the drink dispensers in the dining rooms out of service, and the crew look at you weird if you do come inside and order to eat in.
It seems hardly anyone is willing to even enter these places anymore, which works for me when I'm in a hurry.All of the people who used to be eating their lunch inside are now sitting in their cars to eat.
The drive-through will be 10 or 15 cars deep, but if you park and go inside there is no one in line.
It seems bizarre to me because I would never enter a drive-through lane with a long line of cars.
But it works for me because I can be in and out in 5 minutes while everyone else is sitting in their car waiting for a cheeseburger.