I enjoy KDE more than Gnome nowadays but it's far from being more minimalistic; it has way too much options, applications, dropdowns, buttons, etc. compared to Gnome and pretty much any other DE.
It DOES run great though, but I think they'd do a good job by simplifying some aspects of it, too bad the community seems to be mostly opposed to that as they want KDE to remain a more power-user friendly desktop.
I haven't tried it out in awhile, but I wonder if LXQt might be worth looking at for something more configurable than GNOME, yet more simple than KDE. Of course, there's also always XFCE, MATE, and Cinnamon. I just don't see LXQt mentioned much.
It DOES run great though, but I think they'd do a good job by simplifying some aspects of it, too bad the community seems to be mostly opposed to that as they want KDE to remain a more power-user friendly desktop.