I think this space is booming. Here's a by no means exhaustive list, in no particular order. (Some of them are more responsive to the prompt than others, but all of them have meaty technical content.)

https://www.youtube.com/@ArjanCodes - Python channel, I haven't watched much of it but what I've watched was good, and I have a friend who's found it very useful

https://www.youtube.com/@JonGjengset - Excellent Rust streamer, and does great intermediate & beginner tutorials (with some advanced material). Probably the most direct comparison to Ben Eater; Gjengset's signature is multi-hour videos where he codes things like hashmaps or a TCP implementation in real time, debugging included.

https://www.youtube.com/@Fireship - Byte-sized introductions to popular or up-and-coming technologies, with something of a frontend focus. Great way to get inspiration from technologies you wouldn't otherwise dig into.

https://www.youtube.com/@ByteByteGo - Introductions to system design/distributed systems concepts.

https://www.youtube.com/@CMUDatabaseGroup - Talks from creators of established and up-and-coming databases, and lectures about database theory. If you're learning a new database, even a weird one, you can probably find an in-depth discussion of it's low level details here.

https://www.youtube.com/@kleppmann - Talks & lectures about distributed systems from the author of, "Designing Data-Intensive Applications"

https://www.youtube.com/@Reducible - 3blue1blue style animations (with their own distinct twist) for programming topics.

https://www.youtube.com/@3blue1brown - I know you already mentioned 3b1b, but it can't be recommended enough. If you haven't checked this out, watch their series on linear algebra. It is some of the best math pedagogy of all time. If you've never been taught math in a way that felt exciting and like problem solving, please do yourself the favor of trying this channel out.

https://www.youtube.com/@Mathologer - Mathematical deep dives

Some Brady Haran channels (brief introductions, puzzles/problems, interviews with luminaries like Conway or Knuth - Haran runs a huge number of channels, so keep in mind there are more that may interest you)

https://www.youtube.com/@numberphile

https://www.youtube.com/@Computerphile

Honorable mentions that are somewhat tangential:

https://www.youtube.com/@TechnologyConnections - Not per say a technical channel, more the history of a given technology and how it interacted with it's culture, but great content that any technologist will enjoy. The technology is not just discussed but demonstrated; eg, when discussing Betamax and VHS, he gets these old players working, shows them to you, and helps you feel what watching these formats was like. Hands down one of the best video essayists.

These lectures (I'll be honest and say they get above my head quickly & I've only seen the first couple) have helped me to understand much better how math works, and have made it easier for me to read about math. Their goal is to build up an understanding of theoretical physics starting from formal logic and building up to math, and then beyond.

https://www.youtube.com/watch?v=V49i_LM8B0E&list=PLPH7f_7Zlz... - Lectures on Geometrical Anatomy of Theoretical Physics

There are tons of channels for conferences (eg Strange Loop, PyData, Defcon), and tons of recorded classes from various universities, which I won't list because it seems out of scope, but just to note that they're there.

This is about all I can remember right now, but there is a lot going on in this space, and I don't feel I've explored it properly.