I feel the same way about Unix desktops. The newer stuff just.. looks gross? And it's difficult to use. I'm very thankful for Mate, especially the Alt+F2 behavior, but also the simple menu layout vs some horrible combination of search and popups.
I have an older computer running Ubuntu with Unity 7 DE, I think it looks beautiful. It’s a computer that barely connects to the internet and I use for playing with electronics. I think that was the most intuitive DE on Linux.
There are people who believe that KDE 3 was the perfect desktop. They forked it when KDE 4 was released (initial KDE 4 releases were really rough), called it the Trinity Desktop Environment (TDE). I actually really like modern Gnome but every once in a while I try out TDE and it does give me a nice cozy feeling, like looking at old album photos.
I have a friend who refuses to use anything other than CDE and still manages to compile and run it on modern Linux distros.
GNOME 2/MATE isn't quite to my taste for my personal use, but it is cozy in a way that post-3.0 versions aren't.