Poster 2 above: Name the location, and one of us can test it for you to let you know if it's safe to go back.
In-N-Out does this at the busier drive-thru locations (which is all of them). It's still a bit more than ten minutes when it's at max capacity, but much less than if they had the traditional one order at a time at the end of the line.
At one point the nearest location to me set it up such that I had to interact face to face with 3 people before I would get my food - one to take my order, one to take my payment, one to give me a receipt. Then I'd actually get to the window and be handed my food by a fourth person. This slowed things down substantially because the pattern was so far outside what customers expected. Employees frequently had to chase down people because they didn't stop for their receipt...because where the hell did the idea of a receipt pickup station come from anyway?
The end result is I only go to C-F-A anymore if ordering online ahead of time is convenient. At least then I'm back to the single face-to-face interaction at the point of food delivery. I have zero desire to interact with their employees more than that.
At the places I go to frequently I'm on a first name basis and I see the photos of their kids and share about what's going on in my life.
Face-to-face interactions are much more social than nameless, faceless, speaker boxes.
Think of it as a chance to make 4 people smile, briefly laugh, and get your food. Hopefully those 4 people can make you smile, laugh, and have a tasty meal!
I eat less C-F-A nowadays because they have chosen to make the experience different than other drive through restaurants, and it's not an experience I care for.
Portillo's gets so busy there'd easily be 30+ cars in the drive-through during rush hour, but you'd still get through it in about 10-15 minutes even then.
Granted there's a tradeoff, CFA made the calculation that the extra labor costs for the drive through would be worth the throughput (they usually only do it during "rush hours"). On the other hand looks like Wendy's is taking the opposite approach, throughput matters even less because there are no associated labor costs.