One thing that I would give almost anything for is to have a tool that automatically measured the area of an object.
Inkscape 0.48 added a feature for measuring the area enclosed by a path...
Of course, Inkscape doesn't support a 'library' of parts, per se (that I'm aware of) ... though that would simply be in a legend, another page, and or kept outside the page (for easy drag and drop) - all easily imported. Being all vector (even raster poly is handled as a vector and clippable/deformable and, IIRC, available for 3D transforms as well!), such are easily adjusted, copied, cloned, even interpolated (colors/scales/shapes/etc). Connectors are also supported (like a Visio object), btw. I seriously doubt CC can touch those features. Then throw in advanced filtering, vector brushes and tracing, numerous output options, and probably the best curve editing and drawing tools available bar none (even Illustrator CS6, which I love, lacks spiro curves which are GPL'd and patented!)...
Plus, the SVG can be exported as 'plain SVG' and imported into Sketchup or Blender.
[Don't get me wrong - all this has a learning curve. But I suspect CC is just as steep and perhaps less rewarding...]
If I had a way of doing a deck plan maker for the iPad, I would.
Hehe ... I've been tinkering with such... but I'm afraid its 3D focused and strayed quite a bit from Traveller rules (MTU has been 3D for a long time).
I've considered making a 2D one as it wouldn't be that hard (a current project involves pretty complex in-field 2D mapping) - but the whole licensing and using rulesets that were made for pen and paper tends to put me off. I doubt there is enough of a market to be worth the headache of dealing with the mess of rulesets and their flaws - and the inevitable vocal critics (averse to iPads or this or that rule).
BTW: madmike, nice deckplans!