No, we are not laughing! Many designers will use a pencil for the curves and then move to the computer for calculations and production drawings.
See for example, Dudley Dix,
http://www.dixdesign.com/ch21.htm :
"When I was designing the Cape Cutter 19 I found that I could easily fair the chines in my CAD programs but had problems visualizing the proportions of the panels relative to the overall profile and each other. I did not feel confident of producing a hull that would look good from all angles, so I returned to the old steam powered drawing board to draw the basic lines. After that I went back into the CAD programs for minor tweaking of fairness and to produce 3D rendered images so that I could look at her from all angles. The result is a boat that is attractive from wherever she is seen."