That's not quite true. You can certainly walk into SOG by walking from the Poly, although you can't drive into it in your car without a qualifying ID. If you walk there, you can walk around the grounds and you could likely buy some things, like a milkshake in their small ice cream place, without needing an ID. (We got shakes here and didn't have to show ID, but we didn't ever stop at the coffee place or any of the SOG restaurants when we stayed there in December, so not sure if you need IDs for those places.) But if you try to buy something at the store, you'll be asked for an ID.
-Dorothy (LadyZolt)
What is also cool about the SoG is that it was originally the Disney Golf Resort, built not too long after Poly and the Contemporary. The room sizes are much larger than what you would normally get for the price.