We Are not Idle was quite popular until it was errata'd, when it practically vanished. I'd like t point out that it is still a great card, errata or no.
Let's take a look a pre-errata WanI. You could play it early to get that early game boost, something that Dwarf decks could really use. Late game, you could play it with Lure of Moria to create a broken combo; adding ten+ resources to a hero (and drawing a card). Awesome, right? Right. Too awesome. So when you are not Idle and are Lured to Moria by Atanantar's Tome after eating Second Breakfast, an infinite combo loop is created; allowing you win nearly any quest on turn one. This lead to the fist of errata crashing down on this card.
Now, should this card have gotten the cold shoulder instead of any of the other cards? Could it have just been given a limit on the number of Dwarves you exhaust instead of switching to heroes. Maybe. Either of those would have saved the card's power, but that's not the point. Let's not get to carried away with what-ifs, and focus on how useful the card still is.
You can of course, include it four the sole purpose of thinning your deck, something I find myself doing often. The real strength of this card comes from the ability to boost your first round with an extra card and a resource or two. The cost of a hero's action isn't quite so bad when you're playing something out of the deal. Perhaps an ally to fill the void of the hero you exhausted. Maybe a failsafe in Durin's Song or Sneak Attack. Or what if you just need one more resource to play that Steward of Gondor to kickstart your engine. Of course, this card is nowhere near is powerful know that you exhaust hero's instead of allies. Of course, the infinite combo still works if you add Sword Thain. That's not a problem! Well, the latter certainly is, and the former is unfortunate, but the point is, we can still enjoy this beauty for what it is.