Onsight -- or as I'm calling it, "The Mars Demo" -- is the most demonstrative demo of enterprise applications with HoloLens. Wait stop; come back. I know that sounds incredibly boring. Just imagine you're an architect and, instead of showing your client the blueprints and a 3D mockup, you create a 3D model that you can literally walk around in. Duck down, and your view ducks with you. Turn your full body around, and you see the world behind you.
Since HoloLens has spatial awareness and can make a map of the world around you, it's able to overlay that world with, say, the Martian landscape. Or maybe a pretty townhouse you're thinking about moving into? The former is the case with Onsight, which takes actual data from NASA's Curiosity rover and models it into a version of Mars you can quite literally walk around. It even incorporated pieces of the room into Mars. If nothing else, the Onsight demo is a great example of what virtual tourism could look like on HoloLens -- not anywhere near as immersive as virtual reality, but certainly impressive.