I'd go back even further to find decent Mac UI, to the pre-X OS. Yes, it was a reliability garbage fire, but the Apple of that time really invested in usability. They published a 400-page book[1] for developers that explained the principles behind usability, showed how interface design fits into the development process, and gave specific guidelines for each type of interface element. The guidelines they publish today[2] are a lifeless husk by comparison.