We have the same problem with several users at our University, eg. the Helpdesk have access to all courses and several Faculty/School users have access to their category with tonnes of courses!
We haven't found a nice way to display the category on the front page just for them however I have recommended they use the course search page as their "Moodle bookmark/favourite", eg http://yoursite.com/course/search.php. The users then enter a partial course name or code to find the course they need to look at or work in.
It works for our users, I hope it's helpful for yours
Roles and permissions
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