I'm on KDE as well, but you've got to admit that the way Gnome's overview, virtual desktops, app menu, and search interface all work so seamlessly and logically together is a thing of beauty. Tap "Meta" one time and you can see all of your running programs, drag them between desktops, scroll to switch desktops, start typing to open apps and files... it just works. Meanwhile on KDE, it's a relative pain to remap the "Meta" key and moving windows between desktops still feels clunky even in the overview.

All of that said, I still prefer KDE. Plasma 6 is set to integrate many of the Gnome features above, and KDE's design philosophy as a whole is much more flexible. For example, I use two side-by-side monitors and it makes logical sense to imagine my virtual desktops as being sets of monitors directly above/below my physical ones that I can vertically scroll between. On KDE, it's easy to set my grid of virtual spaces to be one column with many rows and be done with it, or for someone else to pick the opposite, or for them to go with a full grid of spaces if they so choose. But on Gnome, even though the vertical layout used to be the default, their newly dogmatic insistence that we only slide sideways means I'm dealing with multiple plugins that often glitch or conflict with other parts of the UI.

Both systems have their merits and deserve a place. (But I'll gladly fight with anyone who denies that KDE is the obvious king)