< this response is not necessarilly land lubber centric, more of a generic 3D CAD POV - we do Oil & Gas Engineering, which does include site works, though that's not my area of expertise anymore >
We do everything here in 3D (have since the early 90's), cutting views as appropriate for the need, be it plans, elevations, ISO's. I could not imagine reverting back to 2D; pleah.
However, you do need to have skilled folks perform the 3D modeling, not merely posers who have been councilled by employment agencies "Oh yeah, add 3D to your resume, employers just love that". Grrr.
Like everything else in life, you get what you pay for, and quality in equals quality out (conversely the garbage thing). Get good people, invest in training, establish standards, enforce them by making them a condition of employment.
FWIW,
M.