I find that the pinnable watches are a little annoying because it is easy to accidentally create them.  I believe what happens is the focus is grabbed by the watch component, and when I enter a newline to edit the code what happens instead is that the watch is pinned.  I then must grab my mouse to close the pinnable watch, interrupting workflow.  

I suggest that a newline keystroke is overly convenient, and requiring that the user click on the pin with the mouse pointer is convenient.  

I'm excited about the pinnable watch feature, I just find myself accidentally creating them much more often then intentionally.