Why does the moons gravity affect the earth so much

One main reason is, The Moon's gravity pulls on Earth's oceans and distorts them, causing tides

The Moon's gravity pulls on Earth's oceans and distorts them, causing tides. The water on the side of Earth closest to the Moon experiences the biggest pull, and bulges outward. The water on the opposite side also bulges, and the two bulges follow the Moon's motion and Earth's rotation.