It would be so nice if @YouTube gave you a way to categorize or filter channels you are subbed to. Like, I want to look at just the travel-related channels or just music channels. Why is this not a feature?
That's a good suggestion! Please share your thoughts by sending a feedback report from your account. Here's how: https://goo.gl/WdI0BK . You may not receive a response, but we do review all of the feedback and use it to improve your experience. Thanks.