Honestly, WF is the reason I still main my Shaman all these years later. My Shaman wasn't my first character(though it was my first main) but I have the best memory of it.
When you struggled through the Charred Vale and old Needles and your attack rotation was 'Earth shock, refresh lightning shield, auto attack' you know true pain. Then you hit 30. And I'm never one to overrate experiences, but my greatest memory was hitting 30 on my Shaman, getting WF and finally understanding that I was a killing machine.
And then I hit 40. And got Stormstrike, mail armor, and dual wield. And then I became death incarnate(per vanilla leveling standards. I still couldn't beat my Hunter that could solo elites, back when that was supposed to be 'hard') like that fucking escort mission in old needles or the old tiger in the cage.