I don't group exactly, nor do I want to de-duplicate, but I've organised my boxes on the shelf and sorted and labelled them recently, in what seems the most logical way at the time; I have "networking", "USB", "power", "A/V", "PC" and some as of yet unlabelled ones with random stuff I can't place in the others.

There is some unfortunate crossover regarding where things belong because some USB are for power, some are for A/V etc, others or data...

What I realised, when going through these boxes was two things; it would cost a fortune to replace all of the cables in them, I wouldn't be surprised if replacement cost ran into the low thousands of £££ (should they be on my home insurance?!) and secondly; I'm no longer indecisive about what to do with a frayed or otherwise non-ideal cable, it goes straight in the bin; I used to retain the "nicer" ones and solder new connectors if the microUSB had worn out, or the cable was damaged near the end, that got much harder with USB-C unless I'm going for a simple +/-/D+/D-, so I just don't bother.

As for how often they're used; the USB box comes out almost daily, sometimes several times a day, if I'm charging things in my home office, or connecting something that isn't permanently plugged at my desk, I put the cables back away when I'm done. Power comes out every few weeks, and "networking" only when I need to reorganise things in the network cabinet/server rack.

For USB, the "final form" would be to create a labelling system so I can tell at a glance what each one supports, because as it stands I have to pull out my little LED cable tester thing and see how many light up to know if it'll do DP or high power charging etc.