My mom always told me *not* to walk around the house without shoes on in case I was to step on something sharp! (I think she was freaked out by some story she heard about a boy who got hurt bad by something he stepped on.) But it would make more sense to at least *change* your shoes at the door, into e.g. thongs, so you wouldn't be walking around in *bare* feet exactly. (Also, we didn't have central heating, so in the winter the house was kinda cold, so it would make you pretty chilly to walk around in thongs or bare feet/socks... so maybe that had something to do with it as well... and maybe why north Europe doesn't have such a strong custom to take off one's shoes.)
However, I was always used to take them off at a friend's house or when visiting people, because I understood that some people take a lot more pride in their flooring than my parents did (our carpets were just cheap and old things!).
So I guess I had kinda a mixture. And even now I do a mixture, like I always wipe my shoes, but most often I'll change into my slippers when I come into the house, but if they aren't at the door, it's not a big deal. And also I go in and out from the house and outside a lot, so it's a pain to change your footwear every few minutes, so sometimes I'll wait until all outdoors stuff is done.