I shot a 500/CM for a long time and dearly loved that camera. Square made so much sense to me and I still prefer it over other proportions for most things. I even have the bad habit of looking at other images and instinctively framing parts of it square in my mind. I guess even when I don’t shoot it that way, it still sort of is… square to me. I am admittedly an odd bird though.
I only really use my phone when I don’t really care or just to grab a shot for something. Landscape, portrait, crooked, uneven, anything will do for that and it usually shows.