I was more thinking about the odds of out-swimming all the flying metal: thus.
Related note: do -64 guys fly with bottles overwater?
Army requires Horse collars and bottles for any over water flight in all our Helos. Only guys that really use them regularly are the Korea and Hawaii units and any coastal Guard guys.
Riding the Helo into the water just scares the hell out of us though. Its hard enough to unass that aircraft wearing all your crap when its not trying to drown you. The book ditching procedure is for the Front Seater to get out, the pilot takes it a safe bit away, blow the canopy, and then does a hovering auto trying to bleed off as much rotor RPM as possible prior to it contacting the water and turning into a cartwheeling ball of metal and anger... I can tell you most people I know (myself included) are going to get it low, get the hold modes for a nice controlled 6-9 knot hover, get out on the EFAB, and jump. Where it "lands" is not my problem.