I've been using Visual Studio 2012 for some time now (yes, I'm aware that 2015 is already out; sometimes you don't have a choice) and it's been bugging me that when I split a "raft" out onto my second monitor it doesn't behave like a new instance of VS. It only bugs me because it works that way for a bunch of other people and my old system worked that way.
Today I finally found the option to make it work the way I want it to. Tools > Options > Environment > Tabs and Windows > Tab Well > Uncheck "Floating tab wells always stay on top of the main window".
This is so much better.
