I purposefully keep my spaces open because I like the feeling. I like not having every inch of my house not need something in it.
I like to think of it like goldfish. A goldfish will grow to be the size of the tank you put it in, and that's good for a goldfish, but I don't want to be a goldfish - I don't need to jam stuff into every corner of the house just because a corner happens to be kind of empty.