Over here, most people in the UK use some means of public transportation. In some cases it can be costly if you are travelling to and from by taxi/cab. So, the use of online delivery for groceries is a way of life for me. With recent technology, I even have an application for it on my android phone!
I tend to shop at two grocery stores teh most. Either Tesco or Sainsburys. I just found out about http://www.mysupermarket.com/ , which is a website that will tell you about deals you missed, or healthier alternatives, or even if other grocery stores in the area are selling what you want for less money. A pretty good idea. I havent figured out if I am still able to accumulate club card or Nectar points, etc through the website. Great Idea though!
I will say it is nicer sitting down and thinking through meals and menus for the week, rather than going in and buying loads of things I wouldnt do to marketing or... my child trying to sneak something in the cart. Okay, if I am honest... it is usually my husband doing this! Either way, it helps keep the budget on track and with 'favorites' it can be done in a matter of minutes. I do miss shopping and being able to pick my own produce, but if I dont like what is brought, the delivery man will take it back and a refund given.
Just so handy. I know some of the larger cities in the US do this as well, but on a bigger scale here.