I voted sometimes because I don't always take them off immediately when I come in from outside. Otherwise, I am usually in socks or barefoot if it's warm and so is dd, who is at the cruising/beginning to walk stage. DH usually has his shoes on. He does have slippers but they're mostly for nighttime and mornings.
Where we live (Italy) it is unusual to walk around inside barefoot or in stocking feet. The floors tend to be ceramic tile and cold and many people here think you will get sick if you walk on them with bare feet or in socks. My dh is kind of in this camp.
I would love it if people would take their shoes off when they come in, as the streets here are very dirty (few people curb their dogs and there's a lot of littering) and I don't like the idea that dd is playing on floors where that stuff could be tracked in, but I know that asking people to take their shoes off would be considered rude, and it would be unthinkable for most people. I wouldn't even be able to get dh to do it.
We have one carpet, in our living room, for dd to play on and I'm thinking of rolling it up and putting it away for her birthday party in a couple of weeks! Generally I am not a clean freak or germaphobe but the shoes in the house bug me. I'd actually been thinking about it a lot in the last few months as dd has become increasingly mobile, so when I saw this thread, I just had to post!