I have many times upset ATC'ers with the suggestion that they don't have the faintest idea of what goes on upstairs.
Mostly they poohpooh the notion, and seem to think that pilots are there to obey their bidding, not that they are there to provide a service to air traffic.
Yes, it is important that pilots should have an idea of what goes on at LATCC and at their local ATC unit. It is several times more important that ATCO's should have a good understanding of what happend on a flight deck.
I know of many pilots who have visited ATC units. I have yet to see an ATCO on my flight deck on a fam flight.