As far as lines go, one of the things I love about Whole Foods is that they always seem to have enough capacity at the registers so that there's one with no line. Worst case, one person in front of me. And the average cart is small there, so it's quick.
Contrast that to other grocery stores (Shaws and Wegmans, for instance) that seem to calculate exactly how many cashiers they need such that no line is more than 3 people deep, but none of them are idle, ever. And the average cart is full-to-the-brim, so there's always a wait. It can be 9pm at night with 3 customers in the store, but there will still be a wait.
Contrast that to other grocery stores (Shaws and Wegmans, for instance) that seem to calculate exactly how many cashiers they need such that no line is more than 3 people deep, but none of them are idle, ever. And the average cart is full-to-the-brim, so there's always a wait. It can be 9pm at night with 3 customers in the store, but there will still be a wait.