Depends on your use for the map. If you want to track your players movements down to very high detail then you will need a map for that, if you just want the major areas labeled so you can set up individual encounters with a great amount of flexibility but only track their relative movement then the detail will work against you. I find being able to at least describe movement past a good number of local landmarks helps a setting feel more real, even if these landmarks are nothing more than labeled locations.