That's a really great point. After 9/11, it takes so damn long to get to your flight that cutting out an hour of travel time isn't as impactful as before.
If airlines and airports have the capability to get you through security quickly, they don't do a good job of publicizing it.
[1] http://www.portseattle.org/sea-tac/passenger-services/pages/... [2] http://www.flysfo.com/web/page/orphan/faq/#2 [3] http://www.stanstedairport.com/stansted-airport-guide/checki... [4] http://www.jfkairportguide.com/arrivals-departures.html
Airports/ airlines want to get planes out on time, wasting moe of your time makes that easier for them.