We have been having a good experience with the Walmart grocery pick-up app, good enough that I would consider still using it after social distancing is over. There's a few factors that go into this. First and most importantly, it's completely free with no markups, tips or extra charges. I can edit the order right up until the night before, so it's quite convenient to add things as I think of them throughout the week. I dislike shopping at Walmart but their prices are significantly better on most things than other stores in my area. Their stores are so huge and inconveniently laid out that waiting a few minutes in the pick-up parking spot is massively less time. And though the grocery pickers don't do a great job selecting produce, there's a fast refund process in the app when I receive something that's damaged/rotten.
But all that is only a plausible replacement for a store that I hate. I generally enjoy grocery shopping, especially at higher-end or specialty stores and would never replace that with an app. Even Aldi is a delight in comparison with interesting rotating imports and close-outs.
Wal-Mart has the best pickup/delivery web experience out of the four that I've tried as well (the others being Meijer, Target, and Instacart).
They're not my first choice of places to shop, but being able to reserve a slot a full week in advance before you even have to start putting together your order, being able to choose which items can be substituted and which cannot, and being able to add to the order up until about 12 hours before it's scheduled to happen are all pretty nice features that the other places don't seem to have.
And the prices not being any more expensive other than a small flat fee (and tipping the delivery driver if you choose delivery) is nice.
But all that is only a plausible replacement for a store that I hate. I generally enjoy grocery shopping, especially at higher-end or specialty stores and would never replace that with an app. Even Aldi is a delight in comparison with interesting rotating imports and close-outs.