I'm disappointed that Mint is abandoning KDE, but I'll switch to XFCE which is pretty much always my second choice, and my first choice when in a VM, because it's a bit less of a heavyweight environment than KDE.
One of the things I really like about KDE is Dolphin, the GUI file manager. On those rare occasions that I find the GUI file manager to be desired, I like the way it does split screens, and the fact that it understands the 'fish://' nomenclature to browse remote filesystems.
I understand that you can get into flame wars when talking about a desktop environment, but I'm frankly happy that there are many alternatives available. Each person can use exactly what appeals most to them, without having any one perspective to force it's ideas of layout, and workflow upon everyone, (cough, Windows).
Now, if you want to get religious, lets talk about vi, and emacs!
Yup—gotta be vi, or vim, all the way.
OMG, that's a holy war you do NOT want to start, ROFL!!!