depending on how much effort you are willing to put into your paint job, there are things you can do to keep the dust down that most people might not use.
Turn the spraybooth on a while before painting, and leave the room for a while giving it a chance to sort of pull some of the loose dust in the air out.
If you are so inclined, take a spray bottle, put about 1/2 inch of Downey or similar laundry softener and the rest water, then spray the floor. This will serve to also knock more dust out of the air, will keep static out of the rug or carpet if you have a carpeted work area, and will also serve to dampen the floor to keep dust from "kicknig up" into the air as you move around the room. Same principle as the 1:1 guys who hose down the shop floor before painting.
make sure to keep the sides of the paint booth etc wiped down as well, as loose debris will fall from there as well from time to time.