for some users (such as administrators), certain additional fields (such as the number of page watchers) will be displayed.
Why is this for admins only?
For the same reason Special:UnwatchedPages is Admin-only I presume :) to avoid people using this feature to identify unwatched pages to vandalise.
Tom
This tool is not only for admins:
http://toolserver.org/~mzmcbride/watcher/?db=enwiki_p&titles=Main_Page
;)
But it works, if number of watchers > 30
Przykuta