Nope, not really. But it's something I contemplate from time to time. Not in the sense of taking life more seriously than I should, but more in the sense that it's inevitable and instead of dreaded, welcomed. Is there any difference in quantity of death of a insect that lives for one season, or a tree that's there for a thousand years? The season change without interruption, so why this fear of death? Death is one of the greatest taboos of our culture, it is swept under the carpet or even outright denied. Most people cling vehemently to life, and by doing so they strangle themselves and life in the process. We have turned life into a object, something we should "have", instead of experiencing it for what it is.
Just look at how possessive people are when a loved one has a terminal illness. Instead of wanting the person to be released of horrific pain and struggle, they want the person to stay with them as long as they can. That's not love or respect for life...going on while one's condition is terrible, basically inhuman. There are other cultures, mainly indigenous ones who have a completely different attitude towards death, and they know that it's not "the end". There are even ones that celebrate death. I mean how else could it be? Why is there existence? It would be so much easier to have nothing at all. When you have knowledge of your true nature, death is seen as the discarding of clothes.
To me personally the quality of life is far more important than it's length. If I die tomorrow, or in a week, or month, or whenever else I would have peace with it.