It's a major chore! Or, rather, a series of chores.
Consider the following:
Drive to the grocery store, and try to find a parking spot (arguably the most difficult step in the grocery buying saga)
Wander through the grocery store, trying to find the items that were there last week, but have since been relocated. Annoying???
With great care so everything fits, place all the gatherings into your shopping cart. You must perform this task while dodging and weaving around people who have no clue why they went to the store in the first place.
Unload the shopping cart. You must get the cart empty before the cashier runs out of room to place bags, otherwise, they will be on the floor. A tricky task, as the belt is narrow, and does not advance quickly enough to complete the first part of this chore effectively.
*Note to cashiers: No, I do not wish to explain to you why I bought that item. It's none of your business why I have the medical ointment. Yes, those cookies are good, otherwise, I would not have purchased them. It's really not your place to tell me they will make my butt big. I'm glad you have a cat, but I'm not interested in the kind of food it prefers, or that it just got over a bad case of worms. Just saying...
Load the shopping cart again. Nothing fits right this time. :-(
Unload the shopping cart / load the vehicle.
Unload the vehicle.
Carry the bags into the house, taking care to catch items as they rip through the bag.
Another big one here. Unlock and open the door using a combination of your mouth, 1 pinky, and your left foot.
Find a semi-permanent home for all the items.
Where do I put all these stupid plastic bags???
Begin working on next week's grocery list. (No, it never ends - it's a vicious cycle)