I guess I'm doing it wrong with a very successful business.....LOL.
Obviously you are finding clients who appreciate the level of detail you are supplying and you are used to SketchUp and have developed a process that works for you. Whether some other program could do it more efficiently is probably not a big factor in comparison to the time it takes to master any program.
Also if you value CD resolution over time (which you obviously do) you will be able to argue that your method is the fastest that accomplishes your very high standard (and maybe that is so).
For most though we do not judge the efficiency of a program by how well it handles the ability to hand draw and represent every component in a house. If that was my goal I can see how one could ignore the amount of labor required.
I would still rather see Sketchup grow into a platform that is more capable of producing building models efficiently. I do not think it has to come at a cost of loosing it's core strengths.