I've been having the same problem in Sierra. It's a common mouse problem, and I figured Apple should have some way to disable all these spurious double-clicks, but I didn't know about the spring-loaded delay. I've disabled it. I don't know whether that will help.
And no, when I mouse over something I don't necessarily want to open or close it.
Apple really hasn't paid enough attention to accessibility. They've been pushing touch devices, tapping, and gestures, which can be inaccessible to people who are blind, or have proprioceptive issues, or have tremors. They've narrowed the scrollbars so they're harder to use, and they don't allow users to widen them. They've broken another set of mouse accessibility tools with Sierra. They've been pushing the magic trackpad and magic mouse which can wrreck users' hands and wrists.