so true, also, the type of PFD's that most yakkers use won't keep your head above water if you are knocked unconscious. Unfortunately, those types are much too restrictive to use while padding/fishing. All the more reason to go out with a buddy.
It's actually the law to have a pfd on while in a yak in the ocean, so do it!
this is what I have, love it:
MTI Adventurewear PFDs for a water planet - Calcutta