tl;dr: A programmer building his first house used the Vision Pro to walk through 3D models of floor plans, building them in Fusion 360 and populating them with textures, IKEA furniture models, and 3D Warehouse objects for realistic scale. He vibe-coded a custom USDZ viewer called Prospector (open-sourced on GitHub) that adds controller support, skyboxes, terrain following, and reality toggling. He found the immersive walkthrough more useful than his architect's Revit-based 3D tour for actually understanding the space before committing to design decisions.