My childhood was PCBoard, POV-Ray, then later Lightwave, 3ds Max, Bryce. WADs, Hammer Editor, GTkRadiant, both of the scenes. Sierra and Lucasarts games... Turbo Pascal!
I'm building a C++ game engine from scratch with CC. Renderer is Vulkan, no wrappers. Around 30k LoC now, quite a ways to go yet, but CC has been doing fine overall. Of course "he" runs in circles sometimes, but I always manage to nudge him back on track.
It's funny to me how still so many don't realize you don't get hired for the best positions for being a 10x programmer who excels at hackerrank, you get hired for your proven ability to deliver useful products. Creativity, drive, vision, whatever. Code is a means to an end. If you're the type of programmer who thinks of yourself as just a programmer, and take pride in your secure code, ability to optimize functions and algorithms, you're exactly the kind of programmer AI will replace.
Quality of code has never had anything to do with which products are successful. I bet both youtube and facebook's codebase is a tangled mess.