I've never seen that, in anyone I know, after a significant death. I think it's just a literary/TV trope to give an inflection point for a character arc.
Certainly I've experienced deaths (both my parents, my first wife, my longtime best friend), and all I did was grieve for them, it didn't give me a greater feeling of the value of life, so much as a deep resentment at whoever designed this fucked up world, that he* did it so cruelly.
Then I remember God is a ridiculous idea in that sense, and try to relax. Still not spiritual, though.
*God may be nonmale gender, but I think of him as male because men do so much cruelty in the world
