Ok, sounds like left lane of checkpoint 5 is the winner. I'll wait in a longer line to avoid getting groped (I don't do backscatter, which is appears is what SEA has), just wish my flight wasn't so early in the morning.

I have zero experience doing SDOO, so this is all very helpful. My "other" home airport is MMW only, with the WTMD always blocked off. Maybe other airports are better about it?