[DreamFlasher]

For two friends of mine it's BeatSaber for years running strong. I haven't explored that enough on my Quest 3 yet to say I'm hooked, but I can imagine it happening.

For me it's (3D) movies/shows: I generally don't watch movies, I am more a TV show guy. But I'm blown away by 3D movies. I don't like cinemas either, so for me the killer app is "home cinema". Also started to watch 2D movies/shows on it and the "huge screen" is amazing. Agreed an actual home cinema would give me the same effect, but the Quest is a lot more flexible, portable and smaller.