We might be different types of people (your comment about regret strongly suggests we are), but I've been in some very hairy situations where I was fairly sure

We might be different types of people (your comment about regret strongly suggests we are), but I've been in some very hairy situations where I was fairly sure I was about to die traumatically and I didn't experience any of what you're suggesting. Instead it was a calm resignation or acceptance that was oddly peaceful. Not that I don't want to live, but I don't fear death and would take the plane crash over wasting in a hospital any day. I have a DNR registered with the health service in my country to make sure that never happens.