To return to the basics of the question. Why does PaulD only want to produce elevations quickly and accurately? A building is an object in space: the interior plan, spatial organisation and environmental context are fundamental.
Both hand drawing and BIM connected software can prepare 2D presentations from the design. If the full spatial design is only in the head then hand drawing will be the quickest and cheapest. If the design is fully modelled in the computer the 2D presentations can be produced quicker but at greater cost (of modelling the building in the first place). If the design is only complete in terms of 2D CAD then you can't really take advantage of either method!
The commonplace use of Photoshop and similar software to create images is, to my mind, time wasting foolhardiness, unless there is a nice fat fee for it of course!
Having worked with many CAD programmes I would recommend the one that is of best 'value for money' for you: Vectorworks, ArchiCad or Revit (all of which, I believe, meet the IFC criteria for international BIM use and information interchange). The majority of other available software is too engineering based, not written for architects and expensive.
The use of an A0 drawing board, parallel motion, scale rule and set of Rotrings might be very satisfying for our artistic and creative side but very time consuming in an age where everything is required, not necessarily needed, to be done quickly.
Sketchup is an interesting 'compromise' and the 'Pro' version is certainly a contender for projects where information interchange is not a requirement, or the early stages of a project avoiding the costs of a full BIM model too soon.