I've attempted several times to learn how to use Sketchup to design my woodworking projects. Each time, after I've been working on a lesson, or drafting a project, I start thinking "what am I really gaining vs. doing this manually?". It's so much faster to draw it up manually, if it even needs to be drawn at all, especially for hobbyist woodworking projects!
I realize that Sketchup is a very popular software, that for larger projects it may be worth the effort, that duplication or modifications are quickly made, errors may be avoided, that it is "universally" accepted for larger driven projects, etc, etc.
Now I do have to admit that it's harder at my age (almost 75) to retain the details of each lesson, but I do have some background with software-based designs, i.e. over 100 homes/remodeling using Chief Architect. I chose CA over various CAD software because CA is object-based making it fast to work with rather than textual-based which took a lot of time.
So, who uses Sketchup or why not?