Actually, a source control system is a VERY great idea even for 1 developer working on their own stuff. I say this because what happens if you computer crashes, or the server housing the website files? Hopefully, using a source control system you'll have backups running and can easily be restored. Not to mention that if someone makes a breaking change, it can easily be rolled back, or the fact that you can just go back in time if you wish.

Don't think of it as too much, because actually it is VERY worthwhile for you. I would recommend getting Vault, though. VSS is extremely buggy. The great thing about Vault, is that it comes with a single user license, however if you need 2 licenses, you need to buy 2. Still, its a great investment if you lost your code.