re: What do people get out of going to church on Easter once a year?

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Passover is about genocide. Right? Like mass slaughter of innocents, based only on their race or religion.

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No, not at all.
Its about reliving the experience our ancestors went through when they were exiled out of Egypt. To summarize how we were exiled from Egypt, you start with Joseph. In the Torah (your old testament), he was sold to tradesman by most of his brothers. He was later falsely accused of raping the pharaoh's wife (who actually wanted to get laid, but when she was refused she lied to her husband) and thrown into jail.
In jail he interpreted the dreams of a butler and a chef of the pharaoh. He correctly told the butler that he would return to his position and that the chef would be sentenced to death. To return the favor, the butler told the pharaoh of Joseph when he couldn't understand his dreams.
Joseph told the pharaoh that there would be 7 years of bountiful crops and 7 of drought. He was then appointed as gatherer/distributor of rations and made his way up through the ranks. Eventually he brought up his family to live in Egypt and many other Israelites followed.
Ramses was the next pharaoh. He thought the land was becoming overpopulated with Israelites, which he feared may try to take over the throne (no reason why, but anyway...). So he sentenced every newborn Israelite son to death and enslaved all the rest. Moses was born, and to save his life his mother sent him down the Nile in a basket. The pharaoh's daughter (or was it niece? I can't really remember specifics) found him and named him "Moses", or I found him in the reeds.
While there are important events in his upbringing, nothing directly relates or alters the exile of our ancestors, more just the importance of Aaron. So skip ahead to when Moses is an adult. He sees one of his brethren being beat up by an Egyptian master, so he kills him, buries him, and runs away.
He later comes across a bush that is on fire but is never engulfed (my bar mitzvah Torah portion ). He was told to go back to his people and demand to the pharaoh to let them go. So he went back to the pharaoh and told him that for every day he refused, there would be a plague.
After the tenth plague, the pharaoh finally agrees to let them go.
With G-d by his side, Moses split the Red Sea and the Israelites went through it.
We don't eat bread and matzoh instead because the israelites were told to leave quickly, not letting their bread properly rise.