Thanks Kaare/Alan - starting to understand the 2D / 3D relationship in VW a bit more now!
Prior to using SketchUp, I used Rhino on my PC, which was very precise and fluid, but less useful for "architectural" modelling work due to the lack of intuitive parametrics, buggy implementation of blocks, no inferencing in the snap system and no paper space/sheet layer functionality.
Er, and then I got a Mac
SketchUp filled the gap for a conceptual tool, and I am currently using DXF exports of plans and elevations, then redrawing curves and some other details more accurately in VectorWorks. This makes fairly good sense for my own designs, but for taking other people's concepts for which I don't have models and developing them into drawings, without the need for visuals or lots of changes, I had hoped that I could do everything "properly" in 3D in VW.
I will certainly have to get into VectorWorks more, but coming from my workflow, which I have always considered quite amateurish, I guess it's not quite the tool I imagined it to be