It would be a good idea - I agree - to allow others to view who is watching a page. Currently the screen that comes up that allows one to view who is watching a page (and that space) also comes with the ability to add watchers to the page (and add watchers to a space too, in one of Confluence Server's recent updates). For now, those are privileges provided to the space admin, but an unbundling of 'view' and 'add' to allow any user to view watchers certainly seems apropos.
Some teams like the ability to be able to 'force-watch' users to ensure they are engaged in the content, so I think that is a good feature.
as a workaround consider @mentions and tasks. but viewing watchers is a bit of a privacy breach. some people might not want regular users to see that they are watching. so i think it makes sense that only sys admins have that access. although for sys admins, I'd put that feature somewhere in the menu..