Right now I don't go to bed at night weeping that my father only met my mother through a series of unlikely events and so most universes probably don't contain me; I'm not sure why I should do so after having been resurrected in the far future.

Because you understand that you can't change it:

For nothing is more certain, than that despair has almost the same effect upon us with enjoyment, and that we are no sooner acquainted with the impossibility of satisfying any desire, than the desire itself vanishes.

I don't think this claim is true in all cases, but it seems plausible here. There's no adaptive value to learning about "risks" you were subject to before you were able to do anything about them, so I don't feel how bad it was that I almost wasn't born as myself. But I did feel a kind of possible-worlds regret when I stepped out into the street without looking and almost got hit by a bus, since in some likely possible worlds I did get hit by that bus.