A good deal of it is change lists (CLs), which are sort of like pull requests on github, and issue tracking. With inbox I have all CLs that mark me as a reviewe

A good deal of it is change lists (CLs), which are sort of like pull requests on github, and issue tracking. With inbox I have all CLs that mark me as a reviewer explicitly in one bundle, all the ones in my "domain" but not with me as a reviewer in another, and all the remaining in a third. This bundling helps me keep vaguely on top of what's going on while only spending a second or so per email reading the subject line. Obviously, I spend more time on things where I'm marked as reviewer. If none of the CLs stand out to me as something that needs digging, I can just click the check mark for the whole bundle.