I want to be able to go to one spot on my hard drive where ALL website projects are in one place.
Well, this (one spot) directory is "C:\program files\xampp\htdocs". And there you put your sites in different subdirs:
in your Browser: http://localhost/website1/
in your Browser: http://localhost/website2/
No need to change anything in the config file.
You can make shortcuts on your desktop to this direcorys for quick access.