My thoughts are:
Plastic pre-insulated crimps don't look very professional and certainly not OE - so I use non insulated with the clear insulation covers.
Build it like a factory loom - 25 wires all the same length coming into the back of the console are always going to look like a birds nest and they are never done like that by the factory. So I work out a route - loom to first switch (shortest wires), on from that to the 2nd are slightly longer, on from that to the 3rd etc. If there are tons of switches you can run more than one loom to it - but it's still about grouping the wires together.
Tape it up, or use trunking, whatever looks factory for you - but something that makes it hold its shape and look like a loom instead of a mass of wires.
Headers - how you put multiple live and earth feeds makes a difference to how it looks and can reduce the amount of wiring. So far on my Td5 I've done emery thing by tapping into empty fuse and header slots - but when I end up with whole new circuits I'll be looking for some factory type headers if possible.
A picture part way through my winch switch installation, using block connectors but showing the routing and lengths.