Hi ..
Yes, I am a landscape architect and architectural designer ... I use MoI for all my preliminary design work these days. It is such a great fluid 3d modeler and I use it for 2d work as well and then switch to Rhino so I can dimension, note and render with Flamingo (the plant material stuff in Flamingo is very helpful to me). I have also built some abstract tree forms that I can use with MoI and then use Octane for my rendering tool.
I work more than full time at my professional work which has a lot of variation ... I recently designed a Buddhist Temple and am today working on preliminaries for a tiny, wheeled house. MoI really is great at improving my work flow.
cheers,
eric