Jira Misc Workflow Extensions (JMWE) comes with over 40 point-and-click Jira workflow post-functions, conditions, and validators (here is the PDF cheatsheet of all extensions). Configuring these no-code extensions will often be enough to automate most of your workflows, especially the essential ones.
However, what sets JMWE apart from all the "code-free" Jira workflow apps is the extensibility of all these extensions with simplified scripting. Even if you are a Groovy novice, you can use code snippets right inside all extensions for more sophisticated workflows. Our user-friendly editor and tester will assist with scripting - often, you'll be able to click your way through "coding".
Additionally, advanced Groovy users can do super-powerful workflow automation with JMWE. Take a look at this use case that Carl E. Allen just shared on the Atlassian Community site.