Sure, I can try to describe some of what I saw. *Please note that a lot of what I have to say could be read via IGN or PCGamer, etc. This would just be my own experience of some of the demos, and it's meant to be taken from a non-biased point of view.
There were a few demos you can already read about, and in my opinion, each were designed to showcase a unique and different capability of the device.
1) Underwater Demo: Basically standing on the deck of a sunken ship. While you could walk around IRL, it also mimicked in the game walking around the deck. Even though I knew it was VR, I was uncomfortable leaning too far into the abyss below. /r/thalassophobia would have lost their minds!
In my opinion, this was designed to show the capabilities of exploring and being immersed in vastly different worlds.
Painting Demo. This was more in a 8x8 virtual space where one hand/controller was the pallet, and the other was the brush. You could create all different kinds of designs from fire/snow/water strokes, to simple paint strokes in various colors. You could then in real life walk around, and explore your art from any vantage point you wanted. Very neat.
In my opinion, this was designed to show the ability to utilize both the VR space and controllers working together to create unique items.
The kitchen/job simulator. The objective here was within a virtual kitchen to create menu items based on an pre-determined list. Grab items from list, combine certain amounts, and make soup or a sandwich. What's the first thing I did? Grab some eggs on the counter to throw against the wall to see if they break. Yep, they broke.
In my opinion, this was designed to show how everything could work together and be applied for other potential real world scenarios (doctor training, etc. First thing I though of was surgeon sim).
Again, these are already described in many professional blogs, so nothing new. These were just my experiences. The first thing I thought of was the potential for not only this, but the future applications of all VR. I have been following VR for a while now, but seeing these various interactive demos really was eye opening in a way I haven't experienced.
It's true that nobody is talking major titles or games, but the potential is certainly there. It is hard to compare different devices as different demos provide different experiences, and nobody (aside from employees) are probably truly aware what they have that is not shown/discussed. I think what people need to remember is that demos are just that. Demonstrations. They are not designed to sell software, they are not designed to show everything available. They are designed to introduce to the masses the potentially revolutionary abilities that VR can bring to the world. I am just in wonder thinking about what VR will look like in 5-10 years utilizing what I saw. I haven't had the sense of awe and amazement of anything, let alone gaming, in something since I was a young kid running Mario across world 1-1 for the NES the first time. Again, just my opinions on it and nothing new that hasn't been stated on numerous sites, so take it as you will.