On Vimeo.com, you could paginate using keyboard arrows, if you want to. I haven't seen this functionality on any other website. Is keyboard pagination a good option? I'm wondering since I only see it on Vimeo.
Keyboard pagination is something you probably don't see much because the sites that heavily employ keyboard controls are the ones that use infinite scrolling.
However, when it comes to accessibility, keyboard shortcuts are a must. Many users with motor or vision disabilities rely on a keyboard. Think of tab to move between input fields and buttons. A website must be built with accessibility in mind, because the structure is often different from a standard website.
These standardised shortcuts however are mainly related to navigation and not shortcuts for workflows. For more specific features, it remains quite difficult to tie a keyboard shortcut to an action. Shortcuts will differ from website to website, meaning keyboard shortcuts request a certain type of familiarity with the system before it can be used. They're too reliant on expertise which frankly most users will never develop simply due to too little exposure. There are of course exceptions; Sites like Facebook have more extensive accessibility shortcuts for their navigation, partly due to their user base spending more time on their website.