I've been up to Trillium once, just to visit, not fish. It has to be one of the most picturesque locations in the world, but the people there just sucked. I figured it would be a lousy place to fish because of it.
When I was there the shore was full of loud drunk people, throwing bottles into the water, fighting, the works. It didn't leave me wanting to go back. It's just too close to the highway, too close to Portland. I have nothing against drunks, but I think most can relate to the situation.