Pet's are super powerful, there is no doubt about that. With the 2.0.5 changes I feel better about using Zombie Dogs, but I'm still underwhelmed by Firebomb, or other options (Toads) or spiders, for clearing other stuff out when it's not a boss fight.
I hate that 4 of my abilities I never use unless it's a boss fight, or only the rare chance a dog dies. Leaves Piranhado and Firebomb/Toads/Darts/whatever as the only thing left. It makes for boring and slow trash clearing. Sometimes I pop Garg out on trash, since with Grave Injustice, it's cool down comes back pretty quick, but it's still not that often or fun.