This way, as soon as you step into the room, carrying a basket of laundry, you don't have to fumble around for a light switch (or, in our case, walk half way through a dark laundry room to the pull chain, while carrying a large basket of laundry). Instead, as soon as you open the door, the light turns on, automagically! And when you leave, a minute or two later, it goes out. The best part is, the fixtures only cost $10 each (I installed two).
I highly recommend this for any laundry room that is moderately large and doesn't receive natural light (i.e. our Basement Of Doom).