Absolutely one of the worst airports in America of the multitude that I visit. From the rental shuttle experience to the TSA experience to the terminal experience, this is the Flintstones of airports.
Make sure to listen to the music and announcements which feature 32 local Seattle artists who volunteered as part of the Experience The City of Music program.
TSA TIP #5 Once through the x-ray machines take your belongings (trays) off the belts & get re-packed & dressed in the areas designated for this rather than holding up the lines at the x-ray machines.
TSA TIP #1: Before getting to the screening check points clean out your clothing pockets as well as any metals/jewelry etcetera and put them into your carryon bags (or jacket pockets) ahead of time.