Yup. You have my sympathy.
Back in the old days, say 1992, Archicad was fun. It was sort of like SketchUp is now. Easy commands coupled with logical intuition brought success: Architecture was a video game!
Now Archicad is like Leo Kottke on his "My Feet Are Smiling" album where he says "And now i'm going to take a lovely melody and drive it right into the ground." He proceeds to do so with some lovely guitar work.
You are correct that the Archicad interface has become layered and non-intuitive. While easy for an old timer who remembers the incremental changes and copes with them, to confront the program in its complexity all at once is daunting. Plug-ins, Add-ons. Add-ons and Plug-ins. Anything at all with a hyphen.
Let's hope that since Archicad seems to be upgrading with fewer and fewer features each time that they might have time to address user interface and usability issues.
Dwight Atkinson