I just stick everything in regular recycling.
I would guess homeless people are the only reason it's anywhere near 90%. Everyone I know does curb side recycling.
Michigan is different however. When you spend half the year surrounded by snow and freezing temps, even the idea of going outside is numbing.
I was living in Michigan and Illinois this last year, and they are light-years away when it comes to interest and availability of recycling process, compared to Oregon.
I've seen you make this comment twice in this thread and while you say you've lived in Michigan I think you drastically underestimate the resiliency of the majority of Michiganders. It was negative wind chill recently and now that it's back up to the mid 20s I see tons of people walking around without a coat on. The cold doesn't bother us that much.
That might be the biggest issue. Around here (Finland) the deposit system is universal; most beverage containers are standardized and in the system by default. And the machines accept containers not within the system, they just won't give you money for them, so you don't have to worry accidentally mixing containers with deposit and those without.