For me, it's doing all the little things right.
For 2D and drawings, it's making sure line intersections are closed, the hidden lines are the right scale, and the gaps are there on extension lines. It's every little thing that you would care about creating a drawing by hand and not just bashing your way through it as quick as possible because the tool lets you do it.
for 3D, it's having a model that matches the print. Not a bunch of phantom points in space. No datums that don't realate to the part, etc. It should be a clear and logical progression of building the part and aid the end user in understanding the part.
I have seen hand drawn prints that are absolute works of art. If you can reproduce that digitally, then it is craftsmanship. In short, to me it doesn't matter if it is digital or not. Craft a good drawing that communicates the design clearly and concisely to the users. That is craftsmanship.