I just joined this place a few days ago and I love the idea of a community driven map like this. However, it does seem kind of dead... I looked at the history and nobody but me has been active with map editing for the past 3 days.
It's not just you, yesterday I worked on a small settlement to get a feel for the editor, and it took several hours to show up. As of right now, it's completely rendered, although in one zoom level the road isn't as long as I made it.