I would say it all depends on your plan and touring style. We did grocery delivery last trip, and even though we discovered that we could have taken a cab to a nearby Target and bought everything ourselves, I still say it was worth it for us. Instead of spending time shopping, I was spending time in the pool with my family and going out for dinner, while someone else was roaming the aisles finding my groceries for me.
My philosophy is, I spend enough of my life shopping for groceries. When I go on a holiday, it can be a holiday from grocery shopping too!