In my experience, you sort of need to be in a situation where either 1.) You're price-insensitive and really don't like going to the grocery store or 2.) It's inconvenient to go to the store (no car, young kids, not very mobile). The one time I used grocery delivery was when I was on crutches. Peapod was "OK" but the selection was less than the store, they'd be out of things and either didn't substitute or would substitute something I didn't want, and required a bit of planning. I last looked at their site a month or so ago and it looks exactly like it did those 10 years ago.

Instacart, on the other hand, I might use given that there's no Whole Foods especially convenient but--doubtless for exactly that reason--it's not available in my area.