DiskFrontier

The DiskFrontier application is a very nice software solution that you could use in order to view all directories on your computer, including subfolders and other data.
It sports a very intuitive graphical interface packed with all sort of neat tools and features.

Lightweight interface with lots of tools at hand

The application doesn't take long to install and it doesn't have a complicated setup that you would need to complete. It shows you the files that are taking the most space on your hard drive and which files of directories you haven't read or written in months, even years.
The first thing that you need to do after launching the application is to select the directory to log and pick the folders. You can also pick the drives or open the map network drive and pick from there.

View directories and all their children

Next, it will display the progress of its logging process, it shows you read files and directories and this process doesn't take long to complete. It uses bars to display file length in bytes, so you can tell which files take up the most space on your device.
Simply use the directory tree on the left to open multiple folders and check out various files that you've saved on your device.

More features and tools

You have the option to open multiple tabs so you can monitor and manage multiple folders at the same time. You can change the view inside the application, pick between cascade, tile or the option to arrange icons.
At any time you can change the directory that it displayed and have the application show you the file size in percentages.

Adjust settings and enable some features

You can change the log settings and have the application change the color of files that you haven't read for a number of days. You can also run DiskFrontier from the Explorer.
All in all, DiskFrontier is a very nice applications that help users manage their files and folders easily and adjust some settings. However, it would have been nice if it allowed users to preview files or move them to another location.