[PHXFlyer]

I fly through Seattle often and the "C2" gates are no different than any other "commuter" terminal at a hub airport. Have you ever been to SLC or IAH and experienced Delta Connection or Continental Express? It's exactly the same. There's a high concentration of gates in a relatively small area. Many times two flights will be simultaneously boarding from the same podium. It can be confusing but the advice that you were given to "watch the boards" is correct. They will have the most up to date gate assignment for your flight and let you know when boarding begins. Horizon always announces the boarding of each flight on the PA but since there are so many gates in that area the announcement is very localized and can only be heard in the immediate gate area. If they have stragglers I've even heard them shout out names without the use of the PA.