I see things kind of the opposite of punkofnice above. For me my brevity here on this earth imbues MORE meaning into this life that I have. This is it and I want to make the most of it.
Additionally, I see life today as that magic I always looked for in the promised future. The odds that the sperm and egg made me, that there was a successful birth, that I made it out of childhood, didn't kill myself in a car wreck when first driving, that I didn't commit suicide when I wanted to in 2008 because of this awful cult, that I made it to 40, etc.... are the things I try to focus on. They keep me grounded and present. It's hard to be grateful and miserable at the same time.
And yet I still struggle with that eventual goodbye that will come.