For me, the survey job entailed being efficient and had an element of "having to go", so to speak. It was the managing and coordinating everything, by yourself, that was the most challenging. Particularly FBO personel that weren't all that enthusiastic to deal with a 172. Or getting into busy/restricted/prohibited airspace. If that doesn't build up your people and communication skills, I don't know what will. I'll never forget that first day. Fresh from being a hotshot UND and free-lance instructor, showing up in Daytona and being told, "you have an hour to leave for Pittsburgh. I want you there early enough to work the next day". Talk about being tossed out of "the bubble".
Perfect primer for a part 91 corporate or 135 pax job, but it transferred to freight as well. I imagine, it'd be useful in 121. People skills also. You're not just working with strangers, you're LIVING with them for months at a time. Just like freight, survey was an additional and unique perspective outside of the norm. That's a GOOD thing to have. Whatever I guess..
I retract my statement about not valuing my CFI time. That too was another perspective and it taught me patience and acceptance. Which transferred well into being a training captain. One training captain I flew with didn't possess that skill, and to this day, I can't figure out why he wanted to do an arc to ILSs his way so damn bad.