An area manager's responsibility is essentially to respond to user update requests. For this reason, he is given edit privileges within a certain area, even if he hasn't driven there with Waze running. Also, the area manager is the only user that can delete roads; all others may submit potential deletions for area manager approval.
Optimally, an area manager shows elevated interest in the app and the maps, and he should perform numerous edits in his area to make sure the maps are working and working properly. Since you are in the forum, you're off to a good start!
I am thinking about the same thing. Is there a way to know if there is an area manager in my area? (I am sure that there is not as just recently have I found that there have been additional wazers in my city, but I think that I am the only one editing the map.
The only way to know if there is an area manager, is to turn on the area manger layer in cartouche. Each area manager if there is one(s) for that area have a different color, and the area they can edit is highlighted by that color.
In the early days I remember seeing other area managers names, but for some reason this hasn't happened for a while.