It becomes useful when:
You have a large number of items in your ssh config, say 20-100+ and you don't want to jump around in vim.
When you want to control teams' ssh configs using scripts. If you have a team of developers that all have this installed, you can now update ssh configs just by having them run an executable or possibly by some sort of job queue.
Want to switch to key-based access for an old server, delete a different old server and give devs access to a new server without having to coordinate and answer questions with 20+ people? You now have the ability.
Very nice work