It can be crowded, but I go, keep my head down and get my shopping done. It’s really not a big deal. For my family the savings are worth it. Check out lines move quickly and I probably spend less time standing in a Costco shopping line than I do when I go to Safeway or Giant.
+1 I just have to focus on my shopping and not get overwhelmed by the people and vastness of the store. I also put my AirPods in, without music, to dull the sound.
I can't go during the workday, but I have found that Wednesday late afternoons are the best time for me. I also make sure to use the Leesburg one whenever an errand takes me out that way, because it's way less crazy than any of the others.