3D walkthroughs are absolutely the OG[1] use for head mounted displays. I had an interesting experience of a realtor who had a couple of Vision pro headsets that they would let you use to tour properties they had for sale. Definitely faster and easier than driving around only to find you could quickly eliminate a choice. I am not sure what sort of workflow they used to capture the 3D space but I do know they had a Mac pro tower dedicated to running it. As another poster pointed out, if your building a house, having all of the wiring/plumbing/etc in '3D space' databases for your house would come in very handy later as you were doing work on the house. I'm cynical though about timeframes and having data and software for such a niche application work for more than 5 years much less the 10 to 20 you might live in a house.

[1] In the early 90's VRML was going to create a Snowcrash style metaverse of 3D places you could visit.