Wearing a stereoscopic headset is one thing, but the presence that room-scale brings is just another thing altogether. I had tried Oculus demos at conferences and such, and I kinda started to think maybe VR was over-hyped.
Then I got my Vive on pre-order, put it on and went into the tutorial. There was a part where you can inflate balloons coming out of your perfectly-tracked controllers. I instinctively bonked one with a controller, and I FELT it (thanks to haptic feedback from the controller and diagetic sound). I basically forgot I was wearing a headset for the rest of the tutorial, I was present.
That's when it really clicked for me that this is happening this time. This is something new. I'm 100% convinced VR is the new medium going forward.