I don't think the world was in danger of people taking the OP's argument to the witness situation you describe, and thus I don't need that caveat was necessary.
Be thankful that we have the right not to answer questions, and, yes, be thankful that crazy guys like this are out there demonstrating that right. But then remember the social contract and your obligations as a citizen; if the police are asking a reasonable question, you should answer.
I guess they only want to intimidate you and get you talking for a quick psychological profiling. And the OP responds like I wish everyone with nothing to hide did.
And that doesn't mean entrance lines would take forever. Police adapt their routines to the available time and resources.