For us it wasn't actually the angel of death, it was God himself who went and killed all the Egyptian first-born.
Aman already went over it, but Pesah is basically about our road from slavery in Egypt to being free to service our own God in our own land. Since then we've been exiled time and time again, and as such we're looking forward to the next and final Exodus where all the Jews will live in Israel.
Wouldn't really say that we'll rule the world when the Messiah comes, cause we already do
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But seriously, from what I know, it seems its less 'ruling the world' and more, 'the nations of the world will love us' and whatever the inquires, since we're supposed to basically be the High-priests/Kohanim of the world by then. Something like that...