I think probably the biggest help I've got from LLMs is things that are "niche" knowledge, for me. Things like "I need a function heavy in math that when I give X and Y, it returns Z" I could have struggled with for days sometimes when I'm writing games for fun, but with LLMs I can have it done and move on in a couple of minutes, the most time consuming part is writing the tests and overall testing, but I no longer spend days just trying to understand enough math to actually write the thing.