I can count on one hand the number of times I have bought fabric at Walmart but the experience has always been the same (same store). The lady is either there already to cut my fabric, or she arrives quickly so I've never had to wait any great amount of time. I'm always friendly to her, but she acts like she'd rather be doing ANYTHING else than cutting my fabric. It must be terrible to be that cranky. :)
I'd much rather shop at my LQS where they know me by name and would jump through hoops to please a customer. That or online where I don't have to deal with anyone. :)