YouTube has removed the ability to sort subscriptions into collections this year:
Collections are no longer available
The Collections feature was removed on May 26, 2015. We'll continue to focus on other efforts to make your subscriptions even more enjoyable.
Therefore i am visiting their website much less, as the amount of subscriptions is totally unmanagable for me. I do not want to unsubscribe anything, just to have a better overview.
Today i tried around with the RSS-Export offered by the subscription manager in YouTube, but the feeds only supply me with the title and a link to the video. Descriptions or screenshots are not available, so i would have to click on every link, to know, if i want to watch it or not. I have tried importing the rss-file into RSSOwl, feedly, feedreader and liferea, but it sucks everywhere.