I’m a pilot and the job is basically continuous multitasking if we’re using the definition that most people here are using.
While flying on instruments (in cloud or on a moonless night) and with the autopilot off I’m required to monitor/communicate on upto 3 different radios, monitor 6 primary flight instruments and numerous engine instruments, progressively fill out various bits of paperwork while monitoring the fuel situation, as well as physically fly the aircraft and plan the upcoming phases of flight.
Of course, I’m really only actively doing one thing at a time. If I want to adjust the power settings then I need to constantly look away from the engine instruments and back at the flight instruments to ensure that other activities are still going ok.
Personally I don’t feel that this is true multitasking. It is just prioritising tasks and applying full attention for small periods of time as appropriate. It is my opinion that humans aren’t capable of true multitasking.
Even something that appears to be true multitasking such as singing while playing guitar isn’t really. I think the brain turns the two tasks into one single task.
Probably the closest thing I can do that would come close to true multitasking would be playing piano or guitar while holding an unrelated conversation with someone. However, if the musical component is something that I can’t do fully automatically then the conversation stops. I physically can’t talk while concentrating on the music. Interestingly, I can think unrelated thoughts quite freely, just can’t put them into action.