Recent Menu is a promising app, but in the end I found its definition of "recent" too limiting to be useful. It appears that a file is only considered "recent" if it's been opened in an application. Creating a file in an app and saving it doesn't count. Downloading a file or copying a file from an external source doesn't count.
I really like the ability to create and customize "filters," so that I can group files however I want, and show only the types of files I want to see. If RM could show all recent files by including files created or modified recently (this could be an option in prefs), I would buy the app.