I made extensive use of my camera for a watercolour quilt I just made. Made it really easy to check the values (in black & white) to make sure I had the arrangement right. Plus, I often snap a picture just to have something I can see from a distance, as it were. Gives a different perspective on the quilt than looking at the design wall, and has helped me decide on borders and block placement in the past.
My design wall hangs in front of my machine, so if I can't keep pieces straight when I move from the wall to the machine, a camera wouldn't help me much :)