I had fun in the time leading up to the primary here, when I'd drive by a group of Kucinich posters each morning on the way to work. They were on the corner of Grand and Morrison, and each morning I'd honk and give 'em the ol' three fingered salute: The big W and a hearty "Four More Years, Baby, Four More Years!" I tell you, it's hard to be worried when the opposition has nothing to offer beyond Kerry, Kucinich and Nader!
I can't speak to Oregon's system, but we have this in the Seattle area and I think it's great! Once you know how the numbering system works you can almost always find a house with no information other than its address. We bought a map of the area when we moved here 21 years ago, and didn't buy another until two years ago when we had to doordrop campaign literature in a very rural area (the system can break down when the only access route twists and turns).