1. Free delivery on grocery orders.
2. "Scan and Go". When shopping in-store you scan items using the Walmart app on your phone. At check out, you scan a QR code on the self checkout terminal, tell it how many bags you are using, hit the pay button, and you are done. It takes under 10 seconds.
With Scan and Go I can do my in-store shopping at a time when the store does not have many customers (such as 9 AM on a weekday) so it is easy to avoid coming anywhere near other shoppers as I grab items, scan them, and dump them in my cart.
Then it is 10 seconds through the self checkout (and the terminals are far enough apart in the self checkout area that I don't have to be close to anyone else) and I'm heading out the door. I don't bag my groceries there--I just keep them loose in the shopping cart until I reach my car. I then transfer them to my cloth bags there.
It's a little slower if you have items sold by weight. When you scan those it tells you you will have to weigh them at checkout. At checkout it prompts you to put them on the scale, weighs them, and adds them to your order.