I'm very lucky to have a mop sink in the utility room, so thats where I bathe the boys every week. Actually, we refer to it as the "dog" sink because nothing else much gets used in it!
After the bath I'll towel dry my baby on the washer, then transfer him to the bathroom to blow dry. I need to come up with something to put across the sink vanity so I don't have to get on the floor to blow dry (BAD knees!).