Personally, I prefer not to have my desktop cluttered with icons. I like to see the drive icons though for quick access and for reference which drive is mounted or not. I like to see a wallpaper, but it should be something simple, something that does not distract too much, but is nice to look at. In regards to trays, to me it mainly serves the purpose of having a status info of my network connection, speaker volume, which desktop I am on and being able to see the time and cpu temp is nice too. Almost forgot, to see which apps are running.
But all the above is something that is fairly easy adjustable. I'd rather see the menu being more streamlined (definately like the right-click menu). Especially since there is a PupControl, maybe removing all the different apps that control the settings in the menu and just have them in the PupControl. I also would like to see a different icon set. Some of the icons are pixelated, blurry or hard to recognize. Maybe a different way of organizing icon themes, so if someone switches the icon theme, it would affect the change more on a global scale, not just desktop and main categories on the menu.
Not a friend of too many trays. Though I like wbar, it even has a taskbar option, which, I have to admit does not seem to work. At least I have problems with it.