The Ohio City Bicycle Co-Op (Cleveland Flats) has a workshop every year in the late fall addressing winter cycling. At their sessions there are a few people that use slicks year round with good success, they utilize the rigid high-pressure tires to cut through the muck down to the pavement and ride gingerly in slick spots.
To each their own, I don't ride very gingerly, and I don't have the option to coast over slick spots. So extra rolling resistance and noise for me! And oh it's like butter when I go back to my road tires.
