I tried to have fun with generative components in Microstation but houdini is easier and feels more intuitive, also way more felxible.
The IES lighting of Mario is nice to get started with

Damn wanted to make it myself…well luckily i got a few other projects on the shelf so don't have to get bored.
A material library would really help I think. Modeling in houdini is easy and with digital assets you can really create blocks/cells that where the Autodesk and Microstation guys only could dream of. At work we do a lot with sketchup (yuk) but i think houdini could even beat the speed of sketchup with the use of DA's.
Unfortunately, a lot of architectural firms are very deep into maya and 3DMax. I guess what is more important is to get the model out of houdini and into a cad package to make final drawings. The 3D viz is only a part these packages do, they are also used for designing.