Besides very occasional dabbles with gimp-dcraw, the first raw developer I used was Bibble Pro, which turned into Aftershot Pro.
Somewhere around 2014 or 2015 I ended up trying RawTherapee and quickly noticed that I was getting superior image quality from my images it without trying hard. Combined with Aftershot's rather glacial development pace and me preferring open-source solutions where available, I ditched Aftershot and never looked back.
When RawTherapee went a fairly long time without new releases, I tried Darktable and found it being way better than it had been when I had last tried it, maybe half a decade ago, so I moved mostly into using it. I haven't ditched RawTherapee (or its fork ART) completely, but I mostly prefer Darktable and use RT/ART as an alternative if I'm having a hard time with Darktable for a specific image.
As for the user interfaces, I guess I'm pretty adaptive; I'm pretty much at home with Windowmaker on Linux as my desktop environment rather than using so-called modern desktops (Gnome/KDE), and I switch between vi/emacs/VS Code as my editors of choice, depending on what I'm working on in my day job as software developer (although to be honest, in case of customer-provided laptops etc, I mostly just choose Ubuntu and Gnome; it's more convenient to use the same tools the customer developers use too) .