Here, every household entrance has dedicated clearly indicated space for leaving your shoes, coat and other outside stuff. Walking into somebody's home with shoes on is considered very rude, unless you're just fetching something and even then you'd make sure to get permission first or excuse yourself loudly and ashamedly while tip-toeing xD Most don't have carpet floors, but we just don't like wearing shoes indoors anyways. Slippers are for fun or for really cold winter days I guess, but most just wear socks. Unless it's summer, where it's common to go barefoot!
Interestingly, if you live on the countryside, from my experience it's ok to walk barefoot outdoors and then walk straight in. Even though this technically is similar to walking in with shoes on?? d: