I'm using Gotify for receiving push notifications on my phone for things where, in the bad old days, I might've used email. So things like: when my offsite backups complete, if my VPN goes down, on torrent add/complete events, and when motion is detected on my security cameras.

Huginn came into being because I wanted a way to republish some of my emails as an RSS feed that I could subscribe to with TT-RSS (e.g. Matt Levine's newsletter), and for that purpose alone it's justified its existence.

I've also used it as the plumbing that connects my various services to Gotify (Huginn makes a Webhook available and the event gets routed to Gotify). This is, admittedly, entirely unnecessary; I could just hit Gotify directly. But putting Huginn in the middle could give me some flexibility later... and it's there, so, why not use it? :)