I find Insights into Mathematics (https://youtube.com/c/njwildberger) interesting and thought provoking. Even though many subjects are well beyond me, I appreciate the way subjects are dissected and explained. Note though, AFAIU the channel mainly deals with pure mathematics, not always relevant for applied mathematics.
Just a caveat: Wildberger subscribes to a strict, non-mainstream view that rejects the existence of infinite objects. His exposition is fantastic, and as you say the content is definitely thought provoking if you have enough mathematical sophistication to (at least superficially) understand what he's about, but I wouldn't recommend it to anybody who hasn't taken a traditional real analysis course.
