I hated seeing those people who do that, and when I had a black bag I would always pick up one or two bags before I actually picked up mine.
That is why I now buy uncommon colors for my baggage. I don't care what it looks like, I just want to be able to see it as soon as possible and not make any mistakes. Green and orange are the colors I have now for bags and I haven't seen anyone pick them up on the baggage carousel.