This is one of those little issues that has taken me longer to figure out then it should have. I collaborate on a local network quite a bit and often have to tell someone on my team where a certain file is located. Copying and pasting the path directory never seemed intuitive to me, and on OS X (unless I’ve missed something obvious) it wasn’t.
So I finally found the trick in the oft neglected “Services” menu. With any file selected choose Finder > Services > Summarize. This will automatically copy and paste the directory path into the Summary window.
Note: This will also work with some other options in the Services menu, TextEdit for example.