Recently got my car serviced at the dealers (which doesn't happen often because I don't drive much). There were a couple followup customer satisfaction surveys, and the counter guy (not the right designation but the guy who wrote up my paperwork) said his pay depended on my satisfaction.
I mention this because I've never run into this followup with any government office, whether FSA, DMV, SSA, IRS, or whoever. I don't know why.
Actually I do: government agencies figure their customer has to come to them and government appropriators see no need to provide money to measure customer satisfaction.
Though I dinged Al Gore for his Reinventing Government initiative, I think I remember that he tried to emphasize customer satisfaction. At least back when management was looking at county service agencies there was a survey Len C. ran. I'm a bit skeptical of both the one-time survey and the followup one like the car dealer did. I doubt the data is really accurate because I tend to be over generous, but I do think trends, particularly in the followup ones, would be informative.