I sit at an island counter top in our kitchen. It's just the right height with our bar stools and there's lots of space to spread out . I totally understand about the impact of discomfort during the decorating process. There are probably many of us who deal with our own physical limitations so we do the best we can to minimize discomfort. I agree with @Econlady about posture. I have to keep my foot elevated at all times so the countertop is just the perfect height for putting my foot up. Lol.
Additionally, my hubby sets up a 6' table so that I can keep many of my tools and supplies nearby which prevents getting up and down a lot . Perfect!