I think you're looking at it the wrong way, the actual flight controls are pretty rudimentary and simple to understand. The dials represent information and tools available to the pilot should they need them. They're all pretty simple taken in isolation, and they usually have configurable warning states, so you don't need to watch them like a hawk.

Also, you can halve the count in most cockpits, as they'll be redundancy duplicates or co-pilot duplicates. Cognitive load during flight is pretty low, too, so plenty of time to keep an eye on things. Landings and take offs are prepared for with plenty of time ahead (at least they should be) so again, plenty of time to check and configure.