I've been using Subversion for 13 years. You get used to what you know. You hate other people don't use it as they should. Now everyone is transitioning to Git shortly. I love the idea of using new technologies and some of the hooks we'll be able to use with GitLab, MatterMost, and Jenkins.
I understand it's decentralized, but outside of that concept and some light syntax knowledge, I don't know much.
Explain to me like I'm five, please!