I've been watching VFX Artists React (and all the other variants, animators and stuntmen) since the start and it's been really entertaining. I've been wondering if it's been worth subscribing to their website as some of the shows are extended.
If you want some classic old school making of material, there was an old Discovery show called Movie Magic which focused on one particular film every episode. Lots of behind the scenes stuff I had never seen before with material from 90s bangers as Cliffhanger and True Lies. Of course, you can find them on YouTube.