Why would anyone want to go in Heaven?

Existing for all eternity seems to be a pain, even if it's in eternal bliss
At some point you would experience everything there is to experience + there is no chance that 100% of the people you love end up here as well

Another question is, if you could decide when you die, how much time would you roam this universe? a few millions of years? Billions?
Would you enter a never ending simulation where everyone of your wishes are fulfilled as will?