It may be a regional thing. In my 44 yrs of living in New England, shopping here & working here, I've never encountered a store that asks if you need help getting food to your car. I'm also not aware of any stores here that have curb-side pick up of groceries. Last one I saw of those was in the 1970s.
Only place I see people being offered help is at big box stores like
Walmart & Kmart if you buy something like a TV or furniture and they bring it to the register for you from the back room on a dolly cart, then bring it to the front door and that's as far as they go. They'll help get it into your car if you need help.
If you ask, I'm sure they would page someone, but it might take 2 pages to go outside.
Again, I'm sure different areas of the country are different since someone mentioned valet parking at a grocery store in Boca. That would NEVER exist here in New England. I think we are cheap & old fashioned here. We don't want our grocery prices going up by paying for these extra "luxuries" like curbside pickup & valet. I don't think we tend to drive cars we are all that concerned about a ding in. Heck, if you live here your car is filthy 6 months out of the year due to snow & road salt/sand anyway. We as a whole aren't polishing our cars in our driveways every Saturday.
Wanted to add, even my elderly parents aren't offered help getting food to the car. I mean you live here, you can clean off the snow, shovel out your car & get to the store, they probably figure you can get the food to the car just fine too. LOL
I think we are a tough breed up here sometimes. lol