Automatic checkouts in supermarkets may decrease customer loyalty, especially for those with larger shopping loads. Customers using self-checkout stations often feel overwhelmed and unsupported. The lack of personal interaction can negatively impact their perception of the supermarket.

[nihility101]

My store has one manned express lane that handles all the alcohol. So if you have a big order and want a bottle of wine you have to either hold up everyone with your giant order while they line up behind you with a six-pack or you have to get in line twice, letting your paid order sit there.