I find that it’s the opposite. The big names in professional tutorials - Lynda, Treehouse, CodeSchool - are geared towards beginners, and the bulk of their material ranges from entry level to intermediate, and their topics are very mainstream. PacktPub, Pluralsight, Udemy, and Tuts+ offer some material that’s not found anywhere else (even YouTube), but I find their quality tends to suffer. The range of topics that YouTube covers is unapproachable by any single organization, and there are some great teachers, but as you’ve found, there’s also a lot of outdated or poorly made material.
The big difference between the two, I think, is not so much in the individual videos, but the planning that goes into an entire course. What people want when they are looking for videos is for someone to hold their hand through unfamiliar concepts, and that’s much more difficult to do than most YouTubers realize (if they realize it at all). Professional learning sites have entire teams that take care of audio, lighting, planning, and editing, so they can scale their production into dozens of videos per topic.
If you’re struggling with a subject and you find that a site like Treehouse or Lynda has a video series on it, try the free trial. If you find it works for you, then it’s worth the money. The more general experience you have in development, the less you need the hand-holding and the more you can get from the low quality chaff on YouTube.