BTW when I say "using" it, I mean mostly as a novelty, not as a tool.
If it had wider adoption, it could be a great tool. For our little quarter acre lot, there are at least ten locations. So unlike an address, you can use it to specify front door, back door, garage, etc. Aside from a survey, there are not that many things you need to describe to closer than 3 meters, but there are a lot of things you need to describe more precisely than 30 meters or 300 meters if you have a few acres at one address.
Still doesn't solve the problem that EMS deals with in cities where it only works in two dimensions. No way to specify altitude (i.e. what floor someone is on in a high rise)