Frankly I like the trays very much and I don't find them clunky at all. They keep the utility windows out of the drawing space and with custom trays, they can be organized into smaller groups if desired. The tray can be moved to a second screen for those who like that although I prefer to keep them on the same screen so I can use the second display for reference files and other applications. I laid out SketchUp in much the same way keeping my drawing window slightly narrower than the full screen and the utility windows stacked outside to the right. The bonus for me with the tray is gaining additional real estate for toolbars at the top.
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