I don't particularly want to die, but knowing it's going to happen makes life a whole lot more interesting. For me, the looming finitude of life keeps my inclination to procrastinate in check - Why do today what can be done tomorrow? Because otherwise the things to do add up faster than the tomorrows on which to do them.
On the other hand, there's what you could call the Homer Simpson reaction[1]. If you know you're going to die, and you don't even know if it won't happen soon, you might be discouraged from doing things with a longer time frame.
