I like to treat this water proof feature as an emergency feat like an air bag in the car, we dont purposely try the airbag function ayte hehe, for me this feature is for extra protection for our phone, dont really like the idea of showing off it to people, but if once a while i think it is ok to wash it.
Btw wana share a bit of experience wit my new iphone5, a gift from my company, well it was nice as everything is smooth n ofcoz no lag, but after 3 days, i already felt bored with it, the screen is too small, the body felt too fragile n ios is still d same as years ago, i had an ipad b4, it was just the same xcept smaller n can make call.
Overall the iphone is very good n nice but i guess i love android more, i love the widget, the big screen and above all i love that i dont hav to use an itune for android. Really can wait for xperia z to be side by side with my iphone 5. Right now i jusr hv to settle with my xperia arc n d iphone. But obviously the lag on my arc felt worst as i already get use with the iphone lagless. I wont expect the Z will be lagless, but i wish a very minimal lag experience on it. Otha than this lag issue on android, i think its almost a perfect os.