Last time I was down in Seattle though, I noticed they were building a massive elevated (40 mile?) train thing quite far north, which looks somewhat impressive if it wraps up in the near future.
When I visit Seattle I only use public transit or walk to get around. I use the light rail as much as possible, but it only gets you kind of the way to anywhere. Plan on an up to quarter mile walk to a bus stop and then probably an additional bus to actual get to where you want to go. The previous poster is right in that you need to add at least an hour to your transit time to account for waiting for connections.
Also, a large portion of 1 Line's southern section is at-grade with auto traffic.