As someone who has designed avionics for experimental aircraft and rockets, one of the satisfying highlights, like the salty sticky bits as you mop up the plate of a roast, is designing and building the switch panels.

Just as web-UI design can be an all-consuming obsession to get it 'just-so', you can loose yourself in comparisons between rotary switches - finding one with just the right torque and a satisfying positive click, locking toggle switches, the colour of the panels and the colour of the filled engravings to get the readability good in both direct sunlight and dim red-lit cabins, the pride you take in wiring looms that no other humans will likely ever see. It's of course not all fun and games, people's lives will depend on the quality of that wiring loom, and the spark from an unsealed toggle switch in the oxygen-rich cabin is what caused the Apollo 1 fire ( http://en.wikipedia.org/wiki/Apollo_1 ).

So videos like this are quite a source of design inspiration!

Relatedly: if you wonder what goes into making nice panels and wiring looms, have a flick through this: http://www.rbracing-rsr.com/wiring_ecu.html it's motorsport but it's basically the same story for aircraft.