Many years have past, but when I was in school/college I would do my homework wherever I could. Sometimes at school. Sometimes at the kitchen table at home, or at a friends house, or on my bed, on a TV tray, in the stables, and like you on the floor, lol. I, also, had a nice desk in my bedroom at home, which was my favorite and the most comfortable place to do homework. As time past, homework has took on a different meaning for me, it's called business work at home. I have an outside business office close by, but there's plenty of work that I do from home. I have two offices both with nice desks, and comfy office chairs, so one of the two is where it's done most of the time. I, also, have a conference table in my library for meetings where my computer is hooked up to my big screen TV, so often you'll find me in there. It all depends on the type of work at the time. Sometimes I need the large conference table to spread out all my material. I'm thinking that's the same reason you prefer the floor, there's plenty of room.
(Congratulations on your return to college. I loved my college years).