For the last 2 years, the only time I get out of this house is to do groceries when my weekend begins, super early on Sunday morning. There are very few people out there that early, maybe 6 or 7 other customers in the whole store during the time I'm there, and very few cars on the street - but that's more than enough for me.
I had a 3 day weekend a few months ago and went on a Saturday morning instead. By anyone else's standards, it was still super quiet, but it was enough to shock me.
Costco, man... I can't even begin to imagine!