Hooh boy, a genuine forum thread instead of more shitposting. Nice job Ghunny-boy.
Personally, I've only been on the server since 2016. For reference I joined pretty much when Saltire was winding down. The first phase I was really involved with was Redwood, which I loved and still have very fond memories of. Both it, and the second iteration were good fun despite all of the drama and stupid arguments that happened back then. I'm sure plenty of people disagree, but I also loved Silvercrest, though that's probably due to the guild being my friend group at the time. Shimmering Isles was trash, Hemwick was pretty good but they banned my lore-breaking bird-girl which I'm still (not really) upset about. Don't @ me.
As for phases that I didn't have any administrative involvement with; the first thing that comes to mind is Bemillion. Atmospheric custom-lore survival-horror phase set oocly in Gilneas city. All Nightmare fucked looking. It was a great time, I had some really amazing rp, and it was very fulfilling. I love those sorts of phases (likely why I'm doing Mistheath right now) and it was pretty much perfectly done. That's all I can think of off the top of my head. There's been other "good" phases (Controversial opinion: Myrefall was good for what it was) but nothing else really comes to mind.