Yep, for some reason there's a lot of myths about what you should and shouldn't do in a kayak. This is just one of them. One day just for interests sake I'll wear some waders and actually let them fill with water. I'm willing to be that unclipping them and pulling them off is easy enough anyway. but as this video clearly demonstrates, having them fill with water is highly unlikely regardless.  
 
But yes... you are 'hardcore' mate :-)