I would absolutely recommend the garden grocer. We purchased water, fruit, and breakfast items for the week, as well as snack bars to carry in the park. We saved money by not purchasing expensive snacks at the parks and didn't have to hurry to breakfast every morning. When we arrived at our hotel, the groceries were delivered to the room! Much better than having 20 minutes to run through an unfamiliar store!
It arrived before we did. It was awesome! Will definitely use again.
Overall, I'm very pleased and will definitely use this service again the next time we come to Walt Disney World.