Let's play pretend for a moment: imagine an Azeroth that is at peace. The wars have ended, we've beaten all of the bad guys, and it's time to rebuild. Your class no longer matters. There's no need for violent adventurers, your skill in murder and mayhem is obsolete. You are now defined by your profession. Your profession is, in essence, your class. In such a scenario, what profession would you take up? What would you choose as your daily grind?
Let's assume secondary professions are included here. The fun option, in my opinion, would be archaeology. You'd still get to explore the world and have adventures! Realistically, though, I don't think I would mind being a full-time chef. Within the rules of Warcraft, cooks gather most of their own ingredients. As a player, I like killing things. In real life, I love gardening. Skilled cooking requires both, so why not be a chef? I even briefly considered attending culinary school. In Azeroth, maybe I'd do it.
What about you? Maybe you'd be a full-time angler. Heck, El already does it.