Why do I love cats, let me count the ways....
Speed of course. Roominess - I'm a big guy, I don't end up with all kinds of bruises like on a monohull of similar length. Stability - it's nice to go and float about in light winds and just enjoy being on the water. Trapezing - lets you see the whole boat, is comfortable, and just plain fun. Wild Thing - makes downwind as intense as upwind if not more so. Oh, and, the speed.