Double window file managers.
In the DOS days I used Stereo Shell.
There was also a commercial product that worked about the same, but once I had Stereo Shell I never went back.
A good Windows two-window file manager is Free Commander. I use it for moving files around, renaming files, etc. It can do much more than I use it for, too. About the only time I use Windows Explorer is when all I want to do is open a file.