I guess I'm part of the minority that doesn't use them as such. I did have one occasion once that required a bit of surfacing work, but I had to get help. No other time have I needed them.
Now, that being said, what I don't know about hardly lets me use it when needed. How do I know when I need them???
Most of what I design is based on metal fabrication, such as structural shapes, sheet metal, wlmts, castings, etc. I design custom machinery for building and handling cars, trucks, SUV's, etc. Do I NEED to use surfacing techniques to do my job? No - I have done just fine without them. Would they ever help in some way? Maybe, can't answer that one definitively. I would be a fool to state that there will never be surfacing in my day.
So, bottom line is that I haven't seen the need for it yet, but I also haven't look real hard either.
WT