On one hand, what your read online is greatly exaggerated. Most of the time, you show up at the airport, stand in line for 5 minutes, go through a metal detector, and that's it. Just like it's always been.
On the other hand, recently (should I say this anonymously), annoyed by the extra security and machines, when a TSA agent asked me to take off my shoes and my sweater, I said fine. I went topless. After all, that's what the new machines see anyway.
The look on the TSA agent's face? Ouch.