Cars, well, my first one in 40 years is still underway and it's 1/25th. The ones in my stash are all 25th or 24th. In airplanes, most of my collection is 48th, but I lean towards 72nd for multi-engine airplanes. I have one 32nd kit in the stash unbuilt. Armor, I've only done 48th.
I also build the occasional boat, and have done 350th and box-scale. I frequently do science fiction, and they are all over the place in scale from 1000th to 144th to 1/12th.
So, yes, I build scale models.