The one we primarily go to has this but it doesn't really help the actual parking lot issues; it was built 23 years ago. It doesn't relate to how busy the rest of the parking lot gets or how what happened in the OP creates problems.
For instance this is the set up of the one; the entrance to the Costco is circled.
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All of this for for Costco parking
The circle part here is rarely used in terms of cars parked
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This overflow part does get used mostly in the lower half of it and that's when you know it's gonna be an even
more busy day at Costco if this part is filling up
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The other Costco in our immediate area (built 22 years ago) is similar though they have more entrances and exits (the above pic there are two but one is primarily used for Costco the other for the gas station area) but still if you're waiting for a car to leave you're blocking others from getting down the lanes for them to find a spot. In some ways the below Costco can actually have more congestion because of how many entrances and exits because cars are coming from more directions.
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