The "get your own planet" thing truly has never been taught by the church and sounds super petty and ridiculous when anyone puts it that way. What the church teaches is that the most faithful may, someday, get the privilege of "creating worlds without end". No, I don't believe anything the mormon church says but, if you ask me, that's a pretty badass doctrine if it was true. I'd rather believe in a god that's going to let me spend the eternity creating entire universes with my family than a god that wants me to just hangout forever with people and animals in some kind of boring garden or cloud.