I don't care how many times pundits from the Census Bureau muck it up with our lord Jon and savior Steven they aren't going to convince me to answer 10 questions on a census. There is only one question I will answer on that stupid form, and if that lumps me in with the "evil" conservatives, so be it.
Have you actually read the 10 questions?
Questions 1, 2, 5, and 10 are all simply checks to make sure that the respondent really did, indeed, list all residents of the household (which isn't straightforward in all cases -- think roommates at college, for example).
Questions 6, 7, and 9 have all been asked since either 1790 or 1800 and are basic profiling questions. Don't like it? Complain to the almighty Founding Fathers. Question 8 (are you Hispanic) is necessary to make question 7 (race) make sense in a modern world.
Question 3 (your phone number) is to allow easy follow-up; if you don't include it, I don't think the bureau will care unless there's something they can't understand with your report (illegible handwriting, most likely), in which case they'll have to knock on your door to fix it (which costs far, far more of your tax dollars than a phone call).
Question 4, which has been asked since 1890, is the only one that I agree isn't really necessary.
The ten minutes the Census Bureau says this form will take is a gross exaggeration. Two is more like it -- far more than it took me to write this response or you to complain about it.