Coming from an AutoCAD background and transitioning into Revit has left me completely frustrated with the productivity reduction due to the heavy mouse click dependant user interface in Revit. A classic example of this is doing a simple fillet to detailed linework. Firstly I can action a keyboard shortcut to get to a detail line, but from then on it is just painful (simply not being able to keyboard shortcut to the fillet command is a pain) I then need to select the fillet tool, then I need to select that I want to fillet by a set radius, then I need to click into the radius area and set the radius, then select the lines. This is so frustrating and something that seems so simple to fix.