Maia brings a new powerful action Ctrl+Tab that allows you to switch between open files in editor and tool windows. It works similar to Alt+Tab on Windows or ⌘+Tab on Mac.
There are two columns: tool windows and open files (tabs). Navigation is available through the use of navigation keys and Tab (forward) or Shift+Tab (backward) keys.
Is there anything else you think would be handy to have in Switcher Panel?