Last night I added this as my new thinking aid.
I had started with paper then Visio. I stayed with that for years and eventually moved to Dia. Left the Windows platform and switched to TouchDraw on iOS eventually using it on Android too.
DrawExpress is good for allowing my thoughts to flow uninterrupted. You almost forget that you telling the computer to draw. All the earlier apps except pen and paper, you had to consciously pick the right object to bring to the canvas.
Often I had thought of developing a custom app for myself but I had hung up my app making tools years ago, also there is simply no time.