In Seattle you're going to get pretty wet biking to work a significant percentage of the time. Depending on your job that might be an issue. (Or it might not at all. Before I worked from home I used to bike to work and shower there; it was great.)
Also though, not everyone is able or wants to power their own transportation, and although I think biking is great, I this choosing not to is also perfectly reasonable and should also be respected.
The weather isn't that much different to Amsterdam or Copenhagen.
But in both cities, buses have the exclusive use of some road space. This ensures a reliable journey time.
They (or Amsterdam at least) also have amazing bike lanes everywhere. I actually lived and commuted by bike in Ghent, Belgium for a few months, which is very similar. I did indeed get soaked on the way to work fairly frequently, but was able to shower there. I also felt very safe doing so, as bike lanes are everywhere.
That should be 20-30 min by bicycle :) is that an option?