I think it really depends on what you are comfortable with (duh). For us, with two small children, the convenience of being on the monorail led us to book GF for our upcoming August trip. And we'll be traveling in August as well, so we'll be taking a break from the parks each afternoon and the kids will want to swim everyday, so another vote for GS, for its convenience and zero-entry pool, respectively.
For us, because our children are still young, the resort is not just a place to sleep, but a place to relax and enjoy our surroundings. When they are older and can handle a full day in the parks, and thus we really would be using the room for only sleeping and showering, then we'll book a moderate/value, or possibly even stay off-site. However, for now, the deluxes suit us just fine.
Also, what are your expectations of a hotel when you travel outside of Disney? Are you happy staying at a Holiday Inn / Best Western, where the atmosphere / service may not be top-notch but you get exactly what you pay for, or do you lean towards a Westin or Four Seasons for the service and amenities and environment? I know the deluxe resorts at WDW are nowhere close to the Four Seasons in terms of luxury, but they are more comparable.
I say if you are going to be spending more than a couple hours of awake time each day in your room and you can afford it, go for a deluxe. If you will be in the parks from morning to night, then save your $ and go for a moderate / value.
Linda