Oh wait, I did find a use for it recently. My wife and I were trying to figure out what kind of tile we wanted to put in our remodeled kitchen. Everything else was done, but the tile, with so many options, was a real stumper.

So I used Poser to visualize many types of tile. I took a photo of part of my kitchen and loaded it on a one-sided square. I made a transparency map to remove the actual wall. Behind the square, I put two more squares to represent the walls as seen through the photo. I then built 40 different shaders of various types of tile and rendered them with accurate lighting and shadows to see how it would look in my actual kitchen. We found this incredibly helpful.

Here's a sample (not what we picked in the end):

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)