I've heard both sides of the "argument", and its been interesting to get peoples takes on it.
I heard a lot of photographers mention they always shoot manual mode, sometimes they'll use MF for their images (wildlife, people, candids, buildings, whatever). I had a teacher showing us some portrait demos and he mentions that he shoots in "P" mode. Now this is a guy who's been shooting for 20+ years & takes some fantastic images.
I can also see a reason for shooting in manual mode, both AF & exposure in tricky situations. But isn't the one of the reasons we buy these cameras is because of how good their AF & exposure readings are?