Developer now but was originally a mechanical engineer and have dealt with some CAD software in my time. Solidworks > Fusion360 >> AutoCAD 2D has been my experience. Though I have to admit that the AutoCAD 2D was not my day to day software and I had originally come from 3D CAD as opposed to starting with 2D/AutoCAD initially. When I used AutoCAD for the first time I had an instant distaste for it and can see where you are coming from, the interface and the way of "drawing" was unintuitive, and I could never work out how make my lines be parametric instead of having to redraw them when related dimensions changed (though that could be a me problem).

I think the reasons it is still popular are:

- People who learnt to draft with pencil and paper are still around

- Legacy, still so many drawings that they don't want to have to remodel. The open format exports are never perfect.

- 2D layouts are just practical for a lot of industries (electrical, HVAC, MEP, etc) where they are just need to convey connection information or everything is nice boxes on planes and they don't need spend more time extruding out a 3D when they can just easily just draw an arrow and go "AxBmm". But apparently Revit, which haven't used, is becoming more popular int the MEP/HVAC space apparently?

I know my friend has lots of drop in templates and scripts that they have built up over the years.