That's what I can't picture. Blankness. That *poof* everything is gone.
Why not? That strikes me as rather solipsistic. Your belief seems to be due to an unwillingness to believe anything else could be so, rather than a product of rational thought.
It isn't gone though, is it? It continues with or without us. At some point humanity will become extinct but the world will carry on all the same. Then eventually the sun will supernova and destroy our planet.
It doesn't matter though, because there are billions of stars with trillions of planets between them and planet earth's demise will be meaningless.
Humanity is not even a spec of sand in a desert, not even the moss on a rock. In terms of scale, we are too small to register existence.