I easily saved 50% of my food and beverage expanse during a four night stay by pre-ordering from Garden Grocer. My resort was pretty sprawling and my room was a half mile from any of the restaurants. Having fresh fruit and snacks in my room saved me time walking back and forth, particularly first thing in the morning and late at night.
Arrived at WDW resort and my groceries were waiting for me;-)
I was very happy with the service; the delivery person was prompt and polite, and the food was exactly what I ordered and in good condition.