I joined a company that used Debian for everything so I ended up switching to it for many years. When systemd came along I decided to look around again; thus my foray into OpenBSD and my return to Slackware.
If you do give it a look you may be surprised at how little some things have changed. Packages are kept pretty current but the installer and the basic tools are surprisingly similar to the way they were when it was first released in the early nineties.