I'll admit I go to Costco at least once a week for something. I have been to every one in the LV valley. Depends what I need, and how much time I have. Each locale has it's Pros and Cons.
This Henderson locale is definitely the most crowded. Warehouse Staff are nice but busy and hard to find; most cashiers are aloof.
Tire Dept guys are excellent.
This locale needs some self checkout lanes like they have at Summerlin.