For camera racking it's only normally a single primary Grade 1 monitor, (and associated WFM) and you are using the Joy-Stick Over-ride on the OCPs to switch between cameras.
In a large OB truck where there are 25-30 cameras, then you'll have four or five vision engineers looking after five or six cameras each on a very long desk. Again, each is only concentrating on their single monitor. The Vision Supervisor is at the end of the desk, with a router panel and is able to look at any camera and assess.
It's no where near as complicated as sound ;-)