If you are still modeling terrains by hand or avoiding organic shapes entirely, you are limiting your portfolio.
If you are searching for the "top" tier of SketchUp, you should know that (the $699/year plan) now includes SubD natively. sketchup subd license key top
Some popular resources for learning and using SketchUp SubD include: If you are still modeling terrains by hand
Once you have a legitimate license key, here is the "top" workflow to maximize SubD's potential: sketchup subd license key top
Cons:
: If you bought SketchUp through an authorized reseller, you might need to contact them for support.