That's the one thing I always miss about WoW when I play another MMO. The AddOns. There was almost nothing you couldn't do there!
I used to use Discord way back in the day (before BC, he apparently stopped working on it and didn't tell anyone). The UI in WoW was like art. The screen the canvas, the UI Objects were the paint.
And some of the informative AddOns were invaluable. It's funny, but this is about the only reason I wish WoW hadn't failed. LOL