Valve needs to hire this person, my god. Love that they seem to really understand what users do with steam instead of just looking at it from miles away, removing every feature + calling it a redesign.
Steam's UI has long been the worst part of using Steam for me, to the point that I actively avoid using any steam features I don't have to. While they've made small parts of it prettier over time, figuring out how to do anything you haven't done before is difficult, there's clutter all over that makes information like reviews harder to scan, and to top it all off, every single page has a different UI I have to figure out.
Gaming
EthosLab - most authentic Minecraft YouTuber around. No trash clickbait, cringeworthy attempts to appeal to children, ad spam, etc. Just a dude chilling out and playing Minecraft.
Battle(non)sense - Tests various input lag reduction tech + strategies. Input Lag: Low DPI vs High DPI - turns out increasing your DPI can significantly reduce input lag! AMD AntiLag+ vs Nvidia Reflex - turns out not only does AMD's solution trigger anti-cheat, but it also offen increases system latency.
Marblr - High quality analysis of weird game behavior. Mostly Overwatch for now. Overwatch: The Effectiveness of Shield Spinning
People Make Games - Videos about games and the gaming industry. Highly accessible to folks not familiar with the industry. Making Sense of VR Chat, the Metaverse People Actually Like
NoClip - Crowd funded feature length video game documentaries. Making of Horizon Zero Dawn
Makers
ColinFurze - builds crazy stuff and does an amazing job of it! Currently building an underground garage at his house that connects to his underground tunnel system.
I Did a Thing - Australian man with a great sense of humor. Makes ridiculous stuff. Giant Beyblade destroys stuff
...more in Honytawk's comment below
Science + Technology
Applied Science - In depth videos about random science-y things this dude finds interesting. No clickbait, just an excited dude talking about a project he tried.
Atomic Frontier - A lot like Tom Scott. He's also a rare case where the video is more interesting than the title/thumbnail. Generally focused on science-y topics + has shockingly high production value considering the dude seems to be an overworked college student.
NileRed/NileBlue - Crazy in depth chemistry videos. Personally find NileBlue more entertaining as he tends to explore things he's not that great at.
Practical Engineering - Explanations of various civil engineering concepts.
Other
Krazam - Legendary comedy channel focused on software engineering related topics. Most famous video - microservices.
You Suck At Cooking - Short videos presenting recipes in an entertaining way.
Studio Binder ; High quality videos about all things movie/video production. Owned by a movie production software company so you're gonna see ads for it in every video but SponsorBlock gets rid of that with no issues. Ultimate Guide to Camera Movement - Every Technique Explained