I was out in the same storm last night, riding from the campus of a large software company in Redmond down to the Ikea in Renton. The ride wasn't bad except for one point where there was a rather large tree branch across the path. I walked around that one.
Unlike you, though, I did get pretty wet. Not from the outside, but from the inside. It was 50 degrees and I was inside a waterproof raincoat and pants. Even with the vents open (which let some weather in on their own), I worked up a pretty good sweat.
I think I only saw one other rider in the entire ride. This morning I know I only saw two others.