If you live in an "all compiler warnings are errors" world, having two compilers where a bit of code can cause a warning in one compiler and not cause a warning in another compiler is really annoying.
I feel the same way - it bothers me to have tabs open that I'm not actively working on (or, I feel like I need to actively remember the context of all my tabs). When I get to 12 or so I close any tab that I don't feel like I'll want to return to in the next hour.