I don't mind the census questions. I do a lot of genealogy, and can't tell you how much I've learned from prior census reports.
In previous census reports, as I'm sure is true today, the door to door census takers were sometimes rather lazy, and instead of traveling a mile down the road to the next house, would ask neighbors for information about the family. I looked for a couple of years to find one branch of my ancestors on the 1850 census...didn't find them until I found the name spelled as "Barker" instead of "Barber" as it should have been. Either the neighbor, who didn't know them well gave the information, or the census taker misunderstood the name...I think the forms that you fill out yourself are going to be a lot more accurate for future generations to find us! :)