Jillaine, there were 17,000 views to category pages in the past 30 days. But, that includes Category:WikiTree_Help and many other non-regional categories.
Unless you enjoy doing it or expect to get benefits from it, I wouldn't encourage you to spend a lot of time categorizing. If you want to help others and further our mission, certainly the most direct way to do that is by improving the tree.
Another note: There's always a "chicken or egg" problem. If categories aren't used by many people, they're not very useful. If they are used a lot, they become very useful.