Is there really a point to this thread? I mean, there are more campaign worlds that you DIDN'T list than you DID list. In fact, there's no way ENWorld's Poll feature is going to handle all the possibilities.
Fact is, everyone plays in a slightly different campaign setting than anyone else, even if it's the same world. I could play in an FR game set in the Baldur's gate area, and someone else could have a city-based campaign set in the desert of Anauroch(sp). Same world, different campaign.
Might I suggest you just make this poll a regular thread, and then tally up the results manually if you want to come to any firm conclusions.