This is a great idea for an app. Thanks! Just one quibble / suggestion:

The GNU "find" command should typically be available on most systems where this script would be useful (there's a windows port of "find" and now there's macos-X with a unix command-line interface available). When the file space to be searched is really big with lots of files and directories, the "find" utility will be at least 5 times faster than the File::Find module, and some users might really appreciate some means of using this when they happen to know it's available to them.