I’m okay with bagging my own groceries (in paper bags) because of “efficiency” (denser packing than they will do) and “sorting” (these items go in the fridge, and these in the pantry...). I generally send things down the line that way anyhow (heavier items up first). The baggers I’ve seen wait until 50% of my purchase has cleared the cashier and it’s just jumbled.
I sort my groceries too.
And I have had cashiers get mad at me when I ask them to stop picking through my groceries as they come down the line, I put them in the order I want them to be scanned and bagged.
And I had a gal get mad at me one day for improving her crap bagging job so I could tie the bag handles together to keep stuff from rolling around in my trunk.
This past week I started the Wal-mart grocery pickup program. I liked it a lot.