Is there such a thing as a happy Walmart shopper? The only reason to shop there is it's cheap, certainly not for the experience.
A couple of the WalMart Supercenters near me have implemented an all-self service checkout layout with 34 - 40 stations with roaming WalMart assistants. This makes shopping at WalMart a much nicer experience since there are always numerous registers open. I have yet to encounter a wait except on Black Friday morning. For the uninitiated, here is an article with embedded videos that show and explain the new efficient layout:
All Self-Service Checkout at WalMart