Sketchup wont become a viable alternative for most well established firms until the integration between sketchup and layout becomes seamless, ie click a button and floor plans, elevations etc are produced.
That is the biggest gripe that I have found “it is hard to get drawings out of” and this is true to an extent due to the somewhat clumsy way the two programs interact.
And as for the sketchup/layout issues, TEMPLATES, TEMPLATES, TEMPLATES.