It's not all that special. Most planets have a moon/many moons so it's not like it's a distinguishing mark that separates Earth from countless other planets in the Galaxy. The Constellations are a better marker as they only line up if you are really close to Earth so it's a really good indicator of where you are.
Actually while many planets have moons, we have not yet discovered a planet that has a moon that is so big in size compared to its host planet. Our moon appears to be quite unique.