I go out to this Costco once or twice a month to get my bulk items and to shop around to see what new items they might have. They are always packed, but with the wide isles, it is fairly easy to maneuver about with the big shopping carts.
The checkout seems to be the only choke point, but the cashiers move through the customers quickly enough to keep the waiting to only a few minutes. When leaving, the gas pumps are the next usual stop. The lines are always long at the pumps and you can expect about a 10-minute wait to get to the pumps.
The cost savings are nice on bulk purchases, so as long as you have storage space available, you can't go wrong. They also stand behind their products, so it is no hassle if you should decide you want to return anything.