Usability
One product that I feel exemplifies usability design is Apple's MacOS Catalina. I mention Catalina specifically because it is Apple's latest operating system and the most accessible to date. In fact, usability is such a staple of MacOS that during Apple's WWDC 2019 event, there was an entire keynote given on usability and accessibility alone. From a user who does not employ all the accessibility features offered by Catalina, I still think the average user experience is highly efficient and easy to understand and navigate. Virtually every Apple-engineered experience remains consistent with the entire Apple ecosystem and returning users know what to expect, at least from a software perspective. I think Catalina is especially geared toward creatives and tailors itself to every unique workflow, while still adding flexibility. Overall, it's very customizable to suit special gestures, key-bindings, and color adjustments.
An overview of Catalina's accessibility features can be found here: https://support.apple.com/guide/mac-help/use-accessibility-features-mh35884/mac