This is fascinating. Among other reasons, it shows so many people have significant amounts of their living space that they rarely use (the living room, the dining room). I imagine many eat their meals either in the kitchen or the family room. Based on this diagram, I can easily see people being able to get by with almost half the square footage pictured above.
It is nice to have that extra space, but if you wished you could live in a larger space but cannot afford it, you might console yourself with knowing you might not use it anyway. Save your money and live with what you need.