I dye in the kitchen too--there's nowhere else to do it! It's pretty open and well-ventilated, so I'm not worried.
Re keeping the kitchen clean: We have wood-grain-looking counter-tops, and I have a heckuva time determining when they're clean. I wiped an area three times once after a fairly lengthy dye session, only to discover later that I'd still missed some dye powder. I dealt with little blue spots for three days because I never could get it all