I used to feed salmon. It surely prompts a good response. Clowns, anthias, wrasses, cardinals, butterflies, angels, tangs... all sorts of fishes have shown a good feeding response in my experience. There aren't many animals that will turn down fresh salmon!
Being a larger predatory fish, salmon will bioaccumulate contaminants such as mercury to a greater extent than smaller, shorter lived fishes or other animals lower on the food chain. This is why pregnant mothers (and arguably most humans) need to be conscious about their consumption of large predatory fishes.
For my tank, I choose smaller plankton (primarily krill and mysis) and occasionally chopped fish that aren't as high in mercury content as salmon, tuna, swordfish etc. All fish contain trace amounts of mercury. Not being an ichthyologist, I can't speak to how mercury or other accumulated contaminants would effect reef fishes. Perhaps my concern isn't valid.
I think the occasional enrichment with salmon is fine, I just try to err on the safe side.