I think Vaion explained it to you and believe me there is no "we want to nerf druids the most because we hate them"

Honestly, I don't know where you stand in terms of progression but believe me that in late tiers, druid pets are as useless as shaman's. Maybe next expansion or the next one will bring new pets through aa / spells for those two class, maybe not.
Right now the only valuable pet they can get is the one being summoned by Draekon statue in hoh which is way better than their pet spells.
But believe me, it won't change the utility of those two class which are fantastic support class. In late tiers, shaman and druids are a must have in raids, so you will feel loved because you will boost everyone's dps. Point of those two class is to help others dealing more damage. Of course they could use some innate boost to make them dps better (and in that field, I would say that shaman are way behind druid) but I am sure you will learn to live with it but again, that's not their main "role" in a raid.
Oh and I don't run donor robe mage or necro, I live with their pet spells, and I'm happy with it (though donor's are ubber, just for their riposte immunity).
Keep your druid, you will be loved one day ^^