Back when I first started pier fishing, I couldn't figure out two things: why I always had teeth marks in my egg sinkers, and why I had to reel in a bunch of line after feeling a "hit", before actually feeling the fish.
Having spent countless nights out on piers now, I can tell you that 99 out of 100 salmon that are caught on bottom rigs didn't bite. When marshmallows work just as well as ear plugs, styrofoam and cigarette butts, you should know something is up.
Although the occasional salmon might bite in the small pools up river, once again 99% of them are lined or flossed. Totally unsporting and not much fun either.
I haven't fished for salmon anywhere but a pier in years and I can tell you that lures are quite capable of outfishing flossers. The hits are awesome and you actually get headshaking. Being able to turn a fish when it runs -- priceless.