Yeah, also they estimate that it costs about $0.57 for each survey that is returned and about $55 for each survey that isn't.
It gets the funding for your local public services like schools, police, roads, fire, hospitals, etc. You aren't giving, SSN, employment, income, blood and DNA samples and a rectal probe, you just put down the number and names of the people there. Unless you are harboring a fugitive I don't see the big deal.
I am one of the more vocal people I know about the need to re-boot Washington, but I still don't see the big deal with filling out the basic info and sending it back.