I stood outside of work for awhile and people were hanging out sunroofs sitting on the top of cars with flags. About 45 minutes after the game ended they shutdown the corner of 7th and Pike for like 20 minutes because everyone came pouring out into the streets. Then it was just people celebrating, honking horns and drinking after that really. My work is pretty far from most of the bars though really, especially the ones people chill at for stuff like this.
When I got up to the Hill about 30 minutes ago it sounded like Broadway was pretty popping still and the bar across from QFC was packed like flowing out the door.