This is true. But it's worth noting that in terms of mass, it's a lot less than regular plastic packaging as these are very thin coatings. But you are right that this is not a perfect solution. I'm guessing there might be some biodegradable alternatives though for some of these things.

At least cans are being recycled in parts of Europe now. You pay a little deposit when you buy cans of beer/soda and you get that back when you return it. I'm guessing the plastic just burns off when they melt the metal. Even regular cans without a deposit that go in the trash are being separated out probably and recycled.