I think its nice illustration of simple-easy-complex-difficult dichotomy. On one hand it appears super complex. But I suspect it is also conceptually very simple; each switch, button, dial, and indicator is most likely directly coupled to some one specific functionality. In comparison in modern aircrafts, with their sleek glass cockpits, lot of the same functionality might be hidden somewhere ten levels deep in menu hell and might have all sorts of weird modality etc built-in, so they are in some regards conceptually more complex. In similar vein in Concorde the controls and indicators were probably very directly coupled to their respective elements, again being simple in that regard, whereas in modern aircraft everything is done with impossibly complex computer systems that pilots (or even engineers) would have difficult time understanding.