astronaut loses $100,000 tool bag during spacewalk

[Rorschach]

You are not weightless on the moon, it has gravity, it's just less than earth. The reason he is having trouble is not because of the gravity, it's the suit limiting his mobility. The weightless astronauts you have seen are not only in (almost) zero gravity, they are also not hampered by space suits.

As to the dust, the reason dust clouds hang around here on earth is air currents, with no atmosphere on the moon the dust has nothing to hold it up so it falls to the surface as quickly as any other object would regardless of mass.