EDIT: Removed part of the text that was actually about ccsm
*Edit: I mean as my wallpaper.
edit: http://www.omgubuntu.co.uk/2016/07/someone-just-installed-un...
[0] http://www.linuxidc.com/upload/2014_10/14102720535951.jpg
Busyness: 1) hit Alt-F to bring up (say) the Save As dialog box within an application but hesitate a few milliseconds on the Alt key and you get the HUD. HUD was a genius move for using desktop apps on a tablet or similar but you need to be able to bind it to something like the CapsLock key or something).
2) For quite a few releases, Alt-chord mnemonics were broken, but have now been restored, except you have to release the Alt key after the first note of the chord. For instance to insert a formula in LibreOffice Writer, you type Alt-IOF but in Unity (and Gnome) you have to actually type this: Press-Alt-Type-I-Release-Alt-Type-OF.
3) I recollect (14.04? that moving the mouse pointer anywhere near the top left corner brought up the dash by default but sometimes you wanted a menu item
4) Top bar menus on a large screen with multiple windows and multiple applications - huge trek to top bar with risk of target application losing focus.
5) Maximised window with application, user goes to close application but brings up the shutdown menu by mistake (top right of screen).
6) For ages, the Dash took a long time to arrive compared to Gnome (hit Windows key in a live session of Ubuntu and compare with hitting windows in a live session of Fedora Workstation).
PS: Canonical Design used to release details of user testing of Unity. Not so much recently. Anyone know of any user testing results on this?