Hello, DMGrier --
I'm on 'the other side of the mountains' from you. I've also been using Debian-based distros for awhile, now.
My learning progression in Linux began with PCLOS, went to ubuntu (Jaunty) for almost a year, then to antiX-M8.5 and CrunchBang (both Debian-based) and Mint, used both Salix and Zenwalk for a few months and liked the former better. The precursor to Aptosid helped ease me into Debian, too. When Swift Linux came out, I tried and liked it so much I am still using it. The antiX forum is a great community, as is the one associated with Salix.
A person learns to tweak configuration files more with Debian-based and learns how to make hardware work more (in addition to config files) with the Slackware-based distros. I anticipate learning more with Salix or Slackware in the future.
Fedora is Redhat-based, of course, and works well with older PCs. A couple of the 'Spins' intrigued me, but repository problems turned me off of it. I assume the repos are corrected by now. They look good, too (but I have put heavy DEs like Gnome and KDE behind me now, as well).
Package management and large repos are the two things bringing me back to Debian-based distros. The award-winning script smxi makes initial tweaking a breeze, and includes Liquorix kernels options (which can really make a big difference in laptop performance, in my experience). For all these and more reasons, I encourage all to make the next step from ubuntu-based linux to Debian-based, then Slack-based when the time is right (or Gentoo, if you prefer)!