I still do. Phones can be turned to view it either way. Screens can't. I'm not gonna ask my bud to get up and rotate his living room TV 90 degrees so we can look at my vacation photos. Plus, until we learn to levitate with our minds, the plane humans interact is and will presumably remain much, much wider than it is tall, so landscape captures more of it.
I still question why so many people find it so difficult to just turn the phone 90 degrees to the side when you film with it. Is it because you think you look like a dork when you film a selfie with two hands? Because that's not why you look like a dork.