Isn't the "View PDF in browser" setting in adobe itself?
I still use adobe, haven't had any problems with it. Most of my clients don't know the difference between a pdf and a hole in the ground, but they know adobe. I wouldn't want to go install coolpdf or foxit on the 500 or so machines that I manage between all the sites that I work at.
Anyway, it's the default pdf viewer that everyone knows about, so they'll download it themselves if they can't open a pdf anyway.
More to the point, in adobe, click tools, preferences. On the internet section, you should have a checkbox to allow viewing pdfs in a browser. Just uncheck it. Next time you click on a pdf, it will download and open in adobe, instead of showing it directly in the browser.