Well a 1:1 map is super useful. This is another use-case of VR. You can visit appartments or wander the World in Google Earth. I also used this recently for renovation work, my wife created the model of how the studio would look in the future, I imported it in Unity and we visited it in VR before starting the groundwork.

The trick is that the map itself is 1:1 but your moving around in the map is not constrained by the same limitations as in the real world.