Same here. I just show up at (get your pearls ready) Walmart <gasp>, check in on my phone, wait a few minutes and they put stuff in the trunk. The only problem I had was when they substituted (at no cost) many small burger rolls for a package of fewer big ones. I did accept the substitution though so it's on me. I wound up making sliders.

It's basically a more streamlined version of picking up orders in a B2B context. There's just no forklifts trucks or flirting with the gatehouse lady (if you're driving a box truck you may as well act the part).