KDE Plasma is keyboard driven, too. Even for files I hit Super then type only 3-4 letters, then Enter to open it. Or arrow down then Enter if it's not the first in the search. Same for moving windows, Super+arrow to make it half the screen, or Super+arrow left, arrow down to place it in lower left corner 1/4 of the screen, etc, etc.
Gnome is great if you are happy with it out of the box. The moment you want to change something you'll need GUI hacking tools. Even the most basic settings are missing. Gnome has very, very, very few tuning without hacking it.
I've tried 5-10 various desktops when I switched to Linux. Gnome and Plasma were the ones that looked more polished, IMO. Gnome tend to have very few settings, huge buttons and large spaces, great for tablets and phones, good for desktops, too. Plasma has more settings than anyone can wish, denser graphic with normal size buttons, so probably not the best for touch screens. Default Ubuntu comes with Gnome, Ubuntu with KDE Plasma is called Kubuntu, with K from KDE.
You can boot the live DVD for each, without installing, to test which one is the best for your setup. Can be installed as many desktops as you wish later, and you can switch between them without reinstalling, in case you change your mind.
Beware that the Kubuntu installer does not have the option to install on ZFS root. That option is present only in the Ubuntu installer (they have different DVDs to download). For my setup, where I wanted Plasma and ZFS on root, I've installed Ubuntu on ZFS root, then added KDE Plasma later.