I've always done map for my rpg settings. It's a prerequiste to developping the background of the world for me. The maps and the worldbuilding are then interrogating each other all along the process. Every map are generally telling me a story when I look at it... no wonder I love the guild and all its marvelous maps .
And I suppose it's the main reason that explains I'm very fond of mapmaking... and of redoing the same maps a different way or with new elements.