I believe that based on the risks of flying a large metal vessel through the air, sufficient security is needed.
It's a small sample size, but I've traveled on flights for business through several airports, and I haven't encountered or witnessed anything I'd consider unethical by authorities at security gates. I haven't found the lines to be too long, either. I have traveled during holiday times as well.
I try to make it as efficient as possible by wearing simple clothes, flip flops or other easy footwear, and to not utilize a ton of baggage.
I don't have anything to hide, so I don't mind pat downs, metal detectors, baggage scanners, or those full body scanners that basically show what I look like naked. I do think the possible health effects on frequent travelers could be a problem, and an infringement on rights, though.
If a person gets touched the wrong way by an agent, I think they should report it. Though, any sort of touch would have to be rather severe for me to compare it to any sort of sexual assault or abuse.