I think the biggest gift from the shift to the DevOps culture is in thinking "how do I prove this works" before touching a line of code.
We test far more these days than we would ever have been capable of 10 years ago and in a more sophisticated way too. At one point it would have been QA people and DBAs going through preprepared test scripts. If those passed then before rollout you tucked your trousers inside your socks so no-one would know you were scared.
By automating as much testing as possible the stuff that really requires the mark one human eyeball is done by someone unjaded by having to wade through preceding manual tests.
Both speed and quality have increased. Yes, it did take quite a lot of investment to get there but that long term investment now bears fruit.