The indicator on the watchlist (bolded title) and history pages (green box with "updated since my last visit") is ok, but to allow more comprehensive styling it would be helpful if there were a class on the containing <li> (or <table> for the 'enhanced' watchlist) to indicate this as well.
If CSS had some way to target "any LI element that contains a STRONG.mw-watched" this wouldn't be necessary.
Gerrit change will be posted shortly; I need to file the bug first to get the bug number for the commit message.
Version: unspecified
Severity: enhancement