I've always hated it. If you're driving the car at speed airflow seems to make it totally unnecessary, it just smears the already dry windshield again. In fact, it makes me use more wiper fluid then otherwise, because I have to take into account the extra wipe and make sure the windshield will stay damp in the meantime just so it doesn't smear. I always mentally say "f you" to the extra wipe.
WTF has happened to me, I'm complaining about windshield wipers and wiper fluid. This is the beginning of the end.