On any given point in time I have about 5 to 10 Sublime projects opened. Projects that may interact with each other, or at least share some form of impact every once in a while. I find switching between open projects to be a bit of a hassle, so I created Sublimey:
You can use it with your productivity tool (like Alfred or something) to switch between projects. Type in the project in Alfred and press enter; if it's not open, it uses subl to open the project. If it is open, it activates that project window.
In the event other people suffer the same "problem", I put it on Github. I hope you like it!