Boarding lines by class? Absolutely?
Security lines by experience? Great in notion, but people that travel once every 5 years will call them selves "experienced". There will be people just going for the shorter/quicker line just because. How do you PROVE how often you travel? At least with a first class ticket you can prove it. Leave it up to people to make the decision and I guarantee there will be dishonesty.
If TSA is allowing separate screening lines based on ticket price, I really don't care. I say one line for travelers, and one line for crew/"special" vetted people (fed agents, etc). If I'm buying my coach ticket and someone bought a first class, I accept the fact that they might get through quicker, even through TSA. I really just don't care.
TSA is a joke, and a horrible waste of money.