Can you tell VS by now to ignore warnings in 3rd-party libs? Everything that's in Qt's headers is pretty much out of my control but those were by far the most common warnings (or at least I didn't see many real warnings amidst them). At least that's how it's in VS 2010 and it kept me from turning code analysis on more often.
VC++ analysis is useful aside from the fact that it mistakenly thinks every pointer usage is a potential null pointer, but I've gotten better results with clang static analysis.
I configured jshint inspection in a pre-commit hook on my team's code repository. Yesterday I checked the logs and in the last 10 days it prevented 15 commits, a few of which were actual bugs. For me static analysis is a no-brainer. The only challenge is finding the right set of settings that you don't get too many false positives.
(Carmack's review: http://www.altdevblogaday.com/2011/12/24/static-code-analysi...)