Luna is freakishly large, likely because shes debris of extrasolar planet Theia impacting proto-Earth 4.5 billion years ago. this collision could also explain Earth's strong geomagnetism and certain elements that should only be in the outer solar system.
i like to think a moon large enough to eclipse the Sun, despite being incredibly rare, is a common symbol among alien cultures. there's a solar eclipse happening on another planet somewhere, and maybe they are just as amazed at their luck as we are.
Honestly feel there is a good chance that such a large moon is required for life, or at least for technological civilisation. Without tides and the tidal pools they bring, making the jump from sea to land would be a lot more difficult for animals, and as you mentioned, the strong geomagnetism helps reduce atmospheric erosion and surface radiation levels. And of course, our large moon also deflects a lot of asteroids that might otherwise hit us!
Though what is probably relatively unique for Earth, is that we have both total and annular solar eclipses. Because that requires a combination of moon size, orbit radius and orbit eccentricity that makes it only just barely able to cause a solar eclipse. With an even larger and/or closer moon, solar eclipses might even become common enough that most people would be able to see one in their lifetime without travelling far, and thus not be special.