The people who insist on filming vertically with their cellphones have latched on to the excuse “the phone is easier to hold that way”. Well, guess what? It doesn’t make it any easier to watch. The day you actually film something of value and want to watch it on another medium such as a DVD, your laziness will trump any significance the footage contains.
If something is worth doing, it’s worth doing right. If you want your friends and family to enjoy the footage you’ve taken, quit cutting off two-thirds of the picture. Imagine if a friend of yours wanted you to listen to the song they just wrote, and your friend didn’t even bother to tune his guitar, claiming, “it’s easier to play that way.” Vertical filming is to the eyes what an out-of-tune guitar is to the ears, capiche?