Trusted Devices

I've signed in at appleid.apple.com and can see all the devices logged into my iCloud account but, contrary to what I found on Apple's support pages, can't see any list of which devices are trusted. Clicking on the 'learn more' link beside Two Factor Authentication brings up a help page which says "A trusted device is an iPhone, iPad, or iPod touch with iOS 9 and later, or a Mac with OS X El Capitan and later that you've already signed in to using two-factor authentication."
So it looks like all properly signed in Apple devices (except my old MacBook running Montain Lion/Snow Leopard) are trusted whether I like it or not. Is this right?