i agree with everyone in this thread, shut it off.
as easy as it is to turn on and off, it's a lot harder to do wih missing limbs
as far as your experience equation, i've found that those with the most experience are usually the ones to end up with stupid injuries, not all the time of course, but some people tend to act a little more cavalier and careless with their saws, justifying those actions with the old "i've had a saw in my hand since i was 8" bit.
i always keep a litte fear in me everytime i turn a saw on, just for good measure, lol.
and a lot of other good points were raised as well, smoke in your face and harder to communicate, etc.