PK, not sure how I'd react. I'm not worried about the search, either. I guess it would depend on how much of a hurry I was in that day, as to whether I felt like standing on a principle.
On a sort-of related note, another technological Big Brother-ism that bothers me is the taking of mobile devices to check GPS history, and whatever else they feel like checking. I have not personally encountered the practice yet, but have read about it in newspapers. Seems like an awful lot of power to give somebody, without a warrant.