Yes, you can increase the amount of mess you make with a compressor by a whole order of magnitude. The fine mist of Waxoyl, Dinitrol, cellulose paint in a variety of hideous colours and sand blasting media can get everywhere. Inside respirators and disposable overalls, in your ears and up your nose, as well as on furnishing fabrics and on the neighbours' cars. Not to mention how effectively you can chuck the dirt around from grinding, wire brushing, sanding and needle scaling which you can do with the air tools themselves. If you merely had a brush and bucket you'd never achieve that kind of spread or penetration. With a compressor on the other hand you can achieve the kind of plume that would show up on Google Earth if they happened to be taking a picture at the time.