I've been warrior main since 2.0 and I personally think tanking is A LOT of fun but I do find it slightly more challenging than a dps class simply because I have to pay attention to the bosses attacks that are targeted to me (Like Ravens Beak, Mountain Buster etc.) in addition to the other dodge mechanics / doing my skill rotation. Since you've played healer before, you're probably already used to doing that so I don't think you'll see it as too challenging.

All in all, tanking is a blast. Controlling packs of mobs is fun and so is chopping them with a big axe (or sword in your case)