I love hardwood or laminate flooring - when vacuuming I use the hose and the wind it creates when I push it into crevices picks up stuff from an amazing distance - that wouldn't work on carpet. Helps keep behind things where I can't reach from getting too linty!
I use a "high traffic" rug-mat under my chair - one of those low-pile, non-slip mats like businesses put in front of their doors during wet weather. Catches pins before they can bounce away and protects the floor from my chair wheels and is easy to roll around on.
I put a kitchen mat in front of my cutting table to help with hard surface fatigue - it's a nice plush memory foam mat that looks nicer than one of those black rubber ones would look and is very nice to stand on. (My sewing room is my living room so I try to keep it at least semi-attractive.)