I strongly disagree with the notion that only architecture that is based on "blobs" or other "free" forms is "creative". 98.5%(my guess) of buildings built are made of vertical walls, horizontal slabs and roofs that are mostly planar, which doesn't take them out of the realm of "architecture".
BIM tools (I use Archicad and Revit) are mainly about keeping your project organized and manageable, and the main reason to use them throughout a project is that they help to keep all the ugly facts about areas, quantities etc. in order from the start. Clients tend to be overly interested in these. They have also fairly competent 3D modelling tools, and the ability to bring in the "blobs" from other software to build on.
It is OK to sketch in 6B pencil or its digital equivalent but then someone has to add a lot of handiwork to update all the necessary info every time the design changes. Frank Gehry, with the fees he can charge, affords an army of assistants to do this for him, including the advanced 3D modelling work needed.