I don't think I've made plastic bags last as long as you (well done), but I too re-use, including cling wrap. I also use waxed paper. I keep used bags and wraps in the fridge, unless I used them for something dry. I re-use as long as safely possible.
A lot of people at work go out and get lunch or even have it delivered. I see the plastic bags the food came in, in the garbage and think 'that's a garbage bag.' But they just throw it out.
Edit to add: Empty bread and other bags are usually used for litter box cleaning and I may even double them for garbage bags.