While I love to use SketchUp for 3D design, many basic design tasks are fundamentally 2D.
My extensions will enable and streamline such tasks.
I am a licensed architect and have been an avid SketchUp user since the first beta release in 2000. (See my architectural website nearby.)
I have been using 3D CAD since 1977, and also have developed extensions to other 2D and 3D CAD systems at various times since then.