I do it that way because my feet will "tell" me if I've missed anything. I hate it when I've vacuumed an entire room, and I'm sitting there, and I see a Cheerio sticking up out of the carpet. It's not a fun feeling. lol
I have vaccumed bare footed before I am sure. I dont' vaccumn as this isn't my home, but when I do vaccumn, most likely it will be barefooted. Good idea though, you can tell when you've missed something!