I can relate to your "parts" collection. Luckily, my local Waste Management company now holds an electronics recycling day where people can take old electronics and appliances. They contracted with a recycling company that breaks the stuff up and pull out all of the valuable copper, gold, aluminum, rare earth magnets, etc. So far it is working very well and our area is eliminating electronics from the dumps, that is assuming I don't buy it from them at a garage sale.
Hopefully everyone can convince their local company to see the value in doing the recycling.