When an admin protects a page against creation, users don't see any messages when they visit that page, they only notice the option to create the page is missing.
It doesn't matter if it's semi-protected or fully protected.
Currently on Dutch Wikipedia we have a work around for this. We add the page to an existing page that has been fully protected against creation with the cascade option checked. Users get to see an edit button and when they click it, they get a message that they aren't allowed to create the page:
To see the exact reason for the protection, they need to click the link to the page that is mentioned, but at least they know what's going on.
It would be better if an admin could just protect the page and the user would see the entry from the protection log which explains why the page is protected.