Didn't mean to pick on xfce, I haven't used it in a couple years to be fair. But when I did, it just didn't fit my workflow that well. For example, I'm used to pressing command+space and getting system-wide search for all files and apps. This is basically the default behavior on gnome, I just needed to remap the shortcut. I also often move desktops and the "activities" view makes that really simple.