As you know, you can still run the good old Windows File Manager by running winfile.exe. In the File Manager, you can press CTRL and a letter to change to a particular drive. For example, to change to drive d, press CTRL+D. You'll notice that only the root directories on the selected drive is initially displayed making it somewhat harder to hunt for an unknown file or sub directory. Here's how to change to a drive and then expand all sub directories at the same time:
Press CTRL+SHIFT and the drive letter.
For example, to change to drive C:
CTRL+SHIFT+C