My choice of words was a bit myopic. I do agree it can be near-sighted to see predators that eat our fish (or other livestock) as a problem, and not realize how they are beneficial in other ways. I think most people see gophers as "pests," so this was enlightening (to me at least) that blue herons might help to keep them in check.
Of course, I think even gophers have their place in the landscape, providing beneficial aeration and fertilization, among other things. Others might have even better information on the benefits of gophers. I have heard how
voles are amazing at spreading mycelium through their
poop, and I figured it could follow that gophers offer something similar - fertilization at the least!