The only time, for me, this is true, is when it's empty and I have very few items. If there's a line, I'd rather wait for the cashier. Self-checkout seems to get clogged up with people waiting for the supervising human the busier it is, so to have a human or two (one ringing one bagging) when I've got a cart and there's a line, is advantageous.

I'm also pretty anti-social and actually prefer the robotic banter of quickly checking out with a person to the anxious nightmare of just trying to buy something real quick and now waiting because the machine hates life more than me.

Oh and many of the folks doing the bagging at some of the stores are disabled, and I dunno - I hope we're taking care of people in those jobs.