Docker. After using it with almost every web I've developed since 2015 I think they delivered on what it promised to do. It's not a 100% quality of life improvement since certain things take a bit longer to do vs not using Docker (starting containers have a penalty, installing a new package dependency takes a long time to build since layers aren't diffed for changes, etc.). But overall I've found it very much worth using.
Docker. After using it with almost every web I've developed since 2015 I think they delivered on what it promised to do. It's not a 100% quality of life improvement since certain things take a bit longer to do vs not using Docker (starting containers have a penalty, installing a new package dependency takes a long time to build since layers aren't diffed for changes, etc.). But overall I've found it very much worth using.