I have sucessfully set up Application Link between Jira and Confluence, now I'm testing to see what bonus features that gives me in Jira. I've attempted to link a task to a wiki page, but the GUI can't find any pages or even spaces for that matter...

I'm logged in as an account with full system admin access to both systems, I noticed that I needed this level of access to link this project with my wiki space, which is a little disappointing.
I can link to the page using the URL instead I'm just wondering if I lost any special features. What the benefits of linking spaces to projects and tasks to pages?