You would love Costco Mexico:
Must bring at least 5 family members with you, including an abuela in a wheelchair or walker
Stop with entire family in every aisle to talk, make calls, breakdance, whatever you feel like doing, as long as it's stationary
When actually pushing your cart, you must push it down the middle of the aisle so no one can get around you.
Waiting in checkout lines (or any line) is optional. If the line is too long, just approach from the side and push your cart in front of anyone who leaves a 2 foot gap. Act surprised and horrified when other shoppers have the gall to tell you to go to the back of the line. You can also ignore them and pretend to take phone calls.
When checking out, each family member should pay separately for various items in the cart. Pay with coins, but don't began looking for them in your bag until you have seen the total and argued about the price of at least 7 items.