"Does anyone use rhino as their primary architectural cad application"
Not for architectural work, but for marine, which can include structural, mechanical, cabinetry, architectural and other fields. As a previous Autocad and Mechanical Desktop user, I think Rhino makes the journey from concept through to fabrication an efficient and enjoyable process.
I find Rhino 5 is excellent for handling big complex jobs, see the attached non-architectural screenshot for example, and I avoid using Autocad now. When presented with an Acad drawing for modification, I always take it into Rhino and back out when finished. The 2D content in the screenshot was sent on to the client as a dwg.
The Rhino to Dwg transition seems virtually seamless now, although I always open the finished product in Acad (2007), just to check things generally, having been caught out and embarassed in the past. There are only a few niggly changes I need to make in Autocad before sending. (That reminds me, I'll report them shortly)
Using worksession to reference the 3D model and Rhino tools for projecting and remapping geometry, combined with a few scripts to speed things up - and with Rhino's great new toolbar tabs, panels and ease of customisation - and considering the multitude of other improvements, my response to your query is that Rhino is most definitely a complete package in my line of work and has made Autocad and MDT redundant (except for the above). Saving a fortune too …