I also like to stand but usually not for prolonged periods. Normally my sewing is broken up with pressing or hunt-and-search mission or some other distraction so there's a lot of both sitting and standing during a sewing session. Many of the newer machines now have the start/stop button which is helpful for standing ..prevents the need to stand on one leg with opposite foot up. That is the main obstacle to sewing while standing. It can become uncomfortable after just a short time but w/ the button, it is very much easier to do.