I guess it is all down to the user interface. I am not a trained draftsman although I took drawing classes as part of my apprenticeship back in the late 60s (before CAD was even thought of).abbey road d enfer said:It's the standard Autocad interface. It appeals more to people who had formal drafting tuition.
There is a possibility to work in polar; you need to check the help. Me, I don't use them. I'd rather draw a horizontal line and rotate it by a specified angle.
Either copy or offset. Copy will move according to whatever you want, offset will copy at a specified perpendicular distance.
I use QCAD and I love its interface. You click on the line tool and a new toolbox appears with selections for vertical, horizontal, angled, parallel and other types of lines. Pick your line type, fill in the length and/or angle and/or spacing as required and away you go. It even remembers these parameters next time you select that tool. I cannot envisage drawing a point to point line, then setting its angle and then its length as separate operations just to draw a vertical line.