With that said, I'd really like to see better documentation on the Jenkinsfile Pipeline format. I've tried to get started with it a few times, and haven't had tons of success. Stuff like "How do I pull in secrets", and "How do I control a plugin". I appreciate that it's Groovy-based, but that's not particularly helpful information (for a hack like me, at least).
The snippet-generator is nice, but it doesn't necessarily produce working code. Especially for things like getting secrets into a build. And it doesn't give me a broader picture for "How do I even write one of these from an empty text-box".
I recently tried the job-to-Pipeline exporter plugin, and that didn't work on my jobs - it generated stuff that didn't match the input job, and also wasn't structured like the example snippets Jenkins provides natively.
Maybe some kind of a sandbox I could experiment in? Or a REPL or something? It would really help to have something that gave great discoverability, with fast feedback. Faster than I can get by editing a job, saving it, running it, waiting, then realizing I still don't have the syntax right.