On Linux you're not stuck on a single theme. On gnome there is a plethora of extensions allowing to move the task bar as you want. Display the apps on it or not... And plenty more customization.

Gnome has however limited a lot the theming of the desktop (window color, border...). And now it's a bit clunky to install themes other than the default ones.

KDE has more customizations and settings, so much that it could be overwhelming at first.

There are also some differences with the file manager. I prefer Nautilus from Gnome (you can still install it on kde, tho it won't have the same look as the other apps).

And the KDE disk manager may as well be trash in my hands. I can't even setup a mount at boot without getting errors. So I just install Gnome Disks as I find it pretty easy to use.

on Linux if you have multiple partitions, and you want to set a shortcut to a secondary partition, you need to mount the partition (activate it). In Linux a partition is like a folder. It is mounted to a folder.