Before it was moved to GitHub Actions, we had a multiple-step deployment flow created in Node-Red, I believe you can achieve more or less the same thing with n8n. Never tried tho, it wasn't necessary anyway. If I really really simplify it's like, checkout, run some tests, deploy to a preview env, run some more tests, report back to slack.

On a personal level, I use it to automate booking a tennis court. It logs in, selects the date and time (pre-defined), adds a partner/opponent, books the court, pings a service that generates a calendar entry. If I decide to cancel the booking, it again pings the service and removes the calendar entry. I needed to bend some "nodes" to do what I need within the same workflow (such as create event runs once a day but update event runs in every 10 minutes).

In the past, I also used it to detect service interruptions with my ISP. I don't use that ISP anymore, so this workflow is redundant, but it was checking an API and if there's an entry, sending it as a push notification (via ntfy) to my phone.