HMHB
It's not as if we do that for fun. It's a regulation and is designed by the good folks in your government to ensure you have a safe flight rather than a hijacked one. I'm sure the inconvenience of having to pass a piece of paper over to a member of cc is nothing compared to the shocking inconvenience plummeting into the ground at high speed would be, not just for you but also for your family.
Trust me when I tell you that if we didn't have to do it we wouldn't bother with it because we've also got other things on our plate. But since it's a must why not make the best of it and give it no thought? Just hand the piece of paper over, it's easy.