We've done Garden Grocer and we've done the store (not BLT though, BWV).
I actually prefer the store, unless we get a case of water. It isn't that much more expensive, and we waste a lot less and its less hassle.
We pack the stuff that will pack - some peanut butter and jelly, coffee, sugar, cereal. We stuff we can't pack at the screen door - eggs, milk, half and half, bread. But the grocery list is eggs, milk, half and half and bread - not enough to justify a Garden Grocer order or pay the delivery fee.
Garden Grocer was great when we had two families and a much bigger grocery bill. And a case of water from the Disney stores is expensive - at that point its a GG order, and we buy the jelly, peanut butter and cereal from GG.