I personally maintain and use https://www.npmjs.com/package/jira-cmd . Though it has not saved 100 hours but it has saved me good 20 hours over an year. It saves me atleast 20-30 seconds on each jira

some of its functionalities are 1. Unlimited templates for default jira params like epic names, labels, priority etc. 2. alias for frequently used jql 3. aggregation like count,sum support over jql output 4. making multiple jira transitions with single command by saving those transition as comma separated values.

many more such features