It's pretty interesting in retrospect. That snippet of conversation occurs in the context of the mission crew talking about the first men on the moon, and how landing on the moon changed them. Kim, the Sigourney Weaver type lady, was complaining their own mission to Mars will be worthless. "So what do you reckon," she asks, mocking. "We all go back home, find god, write a poem about it like the moon walkers did."
Only, their own mission does change them... IT CHANGES THEM INTO ZOMBIES!!!!!!!
That the movie managed to get away with that kind of referencing without succumbing to hipster irony but instead actually telling some kind of people story--WITH ZOMBIES!!! IN SPACE!!!--it's on a higher level, man. A higher level.