Bob, you are correct. Some courses in MB do this very well. I have played some courses in WA where the pro is out on a cart, the assistant pro in another cart along and their range(s) in yet another cart. They use radios to communicate. They stay on top of things and generally the pace of play moves along just fine. Other courses, the rangers/marshals do what they do every other day…ride by you and wave.
I realize every now and then the cart granny is going to come along and you stop to get something cold, some ice, or whatever. But, that should only put you maybe 1 shot behind which the group can easily catch up…if they just try.