They currently use it mostly to let people walk around and experience buildings. There was a guy who was building his own house, everything perfectly planned, but when he saw the actual dimensions in 3D, walking around his new house, he really didn't like it and immedeately called his contractor to halt the construction. And they've also used it to plan the new campus buildings, since it's a much more powerful communication tool than some renders or floorplans.

Another use is for fear therapy. They have a room with a spider on a table, where people with aragnophohia can walk around and slowly get used to spiders. Especially useful because they can program its movements and because unlike a screen, when people walk around it and have that perspective change, they often cant tell that it isn't real.

They also modded Doom to work on the giant 3D screen but they said that nobody lasted more than 15 minutes due to motion sickness.

We perceive "depth" in ways that don't lend themselves to googles, and no matter how many times researchers spend a shitton on displays, that fact won't change.

Interesting, in what ways do we percieve depth differently? I know our visual field is quite weird but surely at some point it will look very realistic.