Listen to how Green Glue dampens noise  Here's a newer video (very short) that demonstrates the audible difference between a hard material that wasn't dampened with Green Glue versus one that used Green Glue. It does reduce the sharp impact noise quite a bit. The Green Glue side sounds muted, while the non-Green Glue side rings like a chime.   Think of how this could make a difference with walls, floors, and ceilings in your home.    
information and simple solutions for people with neighbor noise.