I spent about 8 years using Solidworks almost everyday when I worked in the aerospace industry (Mukiteo, WA) and I am big fan of Solidworks, its a great product.
I then moved into the residential design and engineering fields as they tended to interest me more than creating tooling widgets for large aerospace companies. Fortunately, I still had access to my Solidworks license for about two years so I attempted to model (3D) detached garages in Solidworks. I was successful however I found it was very time consuming and just not practical and the parametrics and feature tree were sometimes more of a problem than a plus.
Here is an example of a garage I designed fully in Solidworks:
http://design.medeek.com/plans/planset.pl?action=GARAGE4828-A6D-3&action2=null
Eventually, I gave up trying to use Solidworks, it was too cumbersome and time consuming.
With SketchUp and some well crafted extensions I can create the same 3D model in a couple hours whereas in Solidworks this same model took a couple weeks to create.