This is spot on. I took the legs off of my home office desk and supported it ~12" off of the floor with bricks, so that I could sit in a more natural posture. As AC points out, sitting on the floor with a keyboard and mouse tends to "lock" you into one position. This got too uncomfortable for me and I re-attached the legs to my home-office desk.
My work was generous enough to provide a motorized standing desk. I think it would be nice to get back on the floor for short stints but I'm not sure if it can be practically done.