I use it for Finder actions.
Example: I have two computers, a download machine, and my computer. I made an Automator workflow that allows me to select a file (i.e. a bittorrent) right-click and hit my workflow 'send to other computer'. The workflow will automatically take the file, copy it to my torrent folder on my download machine, and run the torrent. Makes it easy to download torrents on my machine and get them going on the other machine without opening an FTP or VNC program.
Another action imports my music into iTunes and tags the files as a 'Complete album'. Then moves the files to the Music folder.
Another workflow takes all selected items and capitalizes the names. Or batch renames files. Or imports to iPhoto. Unistall programs (with AppZapper). Clean up my download folders of zipped files. FTP files locally and remotely. Change desktop picture.
You might get the point. I use it to do a lot of menial stuff.