Being able to explore virtual(and even real) environments as if you were right there is definitely what excites me the most. I've played with Google Cardboard and with it was more durable than it is.
I can't wait until everyone is looking at me strange..... wait they already do that. Well at least with these VR visors there will be a reason for everyone staring at me not because I passed out drunk with gorilla costume on during Mardi Gras.
I am excited for many reasons about VR. I have yet to get any VR set for myself, but i have tried it. I really want it badly. And the fact too, that you can use your phone in order to use VR is amazing. I hope VR and AR come in all forms, especially in everyones pocket.