Currently a new Code Editor window has to be spawned for every script so to work even somewhat efficiently you need either a bookmark system (painful) or a separate Editor window with Assets view open at all times.
It would be greatly convenient if there Code Editor had a Sidebar with a hierarchy of all scripts for the project that you could open with a single click.
We have that in our backlog, I wish as well, simple files tree on left, and tabs on right, just like Atom or Sublime has. This is very useful indeed. And search in files would work really well in this case.