Physicians and nurses are presented with too much complexity for the hard, fast, unpredictable work they have to perform.
This picture of a B36J cockpit illustrates the concept of cognitive overload instantly:
|(Click to enlarge)|
A 360-degree "virtual tour" is at http://www.nmusafvirtualtour.com/media/062/B-36J%20Engineer.htm. Scroll around the cockpit to see more.