Site-to-store does indeed solve a problem. If there is something I want at Wal-Mart, then I have to find it. Not only that, after finding it I need to stand on a long check-out line. With site-to-store, I get it on the web site, then just go to the back of the store and pick it up. The problem is that at Wal-Mart it can be a crap shoot as to whether the site-to-store place is properly staffed.

I actually use the Home Depot site-to-store equivalent much more than the Wal-Mart one [probably several times a month, vs. once or twice a year]. Home Depot gets it right. There are still occasional problems, and it would be better if they could fulfill the orders faster, but it still avoids having to search for stuff, which I consider to be of significant value.

See this comment about the site-to-store please: https://news.ycombinator.com/item?id=8028352

For driving it really depends on the city and the persons situation. Many people drive by a walmart on their commute, the ability to order something in the morning then pick it up on the way home would be convenient. For businesses someone could order something the night before and pick it up in the morning and use it at work that day, that would be very valuable.