Peter, I agree that it may not be the most attractive graph in its current state. But I work in the same field as James, and frequently it's important to see both the absolute values and the timecourse behavior of multiple (5-6) variables. At the moment, it's difficult to display this type of data in JMP. It would be convenient if multiple Y-axis support and scaling were added in a future JMP version.
One way to address some of the aesthetics of this graph would be to move the y-axis labels to the top or bottom, so that the multiple axis labels could be compressed into a smaller space.