I've got a pair of FiveFingers Classics and they're great on the boat...the best deck "shoe" I've ever had. The tread is non-marking and is sipped for great traction. Additionally, you'd be surprised how much more grip you have when you get your toes involved in the process. They're also great for going ashore on slippery rocks, swimming and wading. You do give up a bit of protection, but I've always worn Crocs or gone barefoot on deck anyway.
If you haven't looked there are many different styles of FiveFingers available, including ones with straps for extra snug fit (Sprint, KSO, Flow), neoprene for water performance (Flow), open top designs for warm weather (Classic), etc.
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