I've taken a good look at Endeavour, and it might be a winner for me! Admittedly, the terminal focus might be a bit much for me to start out, but it seems a lot more approachable than bare Arch, and I got comfortable with pacman and the other basics in an evening of messing with it in a a VM (with the Arch and EOS docs both being very helpful!) It just might be the push I need to let go of my reliance on GUI left over from Windows :-)
Great points, all in this thread! Yes, I'm aware of GNOME extensions, and I'm considering sticking with Mint more seriously now, given the response. I think the broader point here is very sage advice, and most users at this point in their Linux journeys, including me, need to hear that. I do intend to try out other distros in a VirtualBox VM for at least a week or so before nuking my current Mint install - however long it takes for me to be sure it's a better fit than Mint, which I imagine that many candidates won't be. For instance, I've decided from a quick try at Arch in a VM that it's still a good ways over my head - and may never be right for me, which is fine. I can say I've tried it now, and trying different things is good. Such is the nature of the beast! :-)
I'm not expecting a huge difference between my Mint Cinnamon and something like Manjaro KDE Plasma (the most interesting option to me right now.) I'm a tinkerer at heart, though, and while I'm not experienced enough with Linux yet to appreciate the differences for what they are, I do fancy myself the kind of person to care about those things... as soon as I figure them out, that is. :-)
While I understand now that I'm unlikely to see much of a UX change by hopping distro - thanks all! - I'm now mostly interested in an Arch-derived distro like Manjaro because I feel like its rolling release model is better suited to my personal tastes than Mint and the Ubuntu umbrella's stable releases, good as Mint has been to me. It's largely a preference thing for me, though, and I'll be investigating further before deciding whether it's what I want.