Go is a very productive language in several senses in my eyes. It is a language you can master quickly, and it is a very productive language in day to day work. There it is important to consider the overall productivity. There are certainly languages, which allow you to implement something a little bit quicker, but you have to consider also the effort of maintaining and further extending a program. For long-term maintenance, Go especially shines. It is easy to come back to some software and pick up modifying it again, and also when there are properly set up packages, Go software tends to be maintainable and extendable.