In my own defence I will say the discrepancies I've encountered between my 2D drawings and the 3D model to be quite small. The differences I've seen are not really wrong or bad, but rather just a bit different than I half expected.
There is something else to be said for modelling or drawing on the computer: it's easy to erase and start again without actual date product such as paper or building materials. You can try something new without really having to commit to it if it doesn't work out. Just erase it and try it a different way.