I agree; one of the things I love doing in general is world building, and I think I was lucky to have started my current D&D game with a map I had made practising the Atlas style. I've since started 'zooming in' on areas that they spend a lot of time around and presenting those maps for them, and it's to the point where their first objective now when they get to a new area is ask the local people for updates to their map, or search for a cartographers guild (which is annoying, 'cos it makes me want to do more maps of places very far away). The scale of my world is of a planet bigger than earth, and I think it'll come back to bite me in the ass eventually.

Keep up the mapping, if you get more, can't wait to see them