The June National Geographic article is much less focused on this "city of the dead" idea. It gives a bit of airing to a couple of current theories, which is a good scientific way to approach things.
I too visited Stonehenge a few years back and don't remember anything about it being a burial site, so this might be relatively new information.
I'm curious if they've excavated other areas of plains, maybe there are bodies all over, so the Stonehenge ones are nothing special.