The plan was to opt out of the full-body scan and to request only the pat-down, which takes significantly longer and would slow down the lines for everyone.
Well so far, National Opt-Out Day has turned into "a few disgruntled and annoyed flyers day." Reports from the busiest airports are that security lines are moving quickly and without incident, with only a few isolated cases of protestors, a number too small to even cause a minor inconvenience.
An interesting angle to the TSA controversy is germs. Yes, now we need to worry about germs when going through the pat-down.