They're lame. I knew I hated them as soon a I read them, and I hate them even more now after dealing with them all expansion. They're simply lazy, and they add zero 'fun' to gameplay.
It'd be like shaman weapon imbues or deadly poison lasting 1 minute, Shadow and Moonkin form only lasting 1 minute, hunter and warlock pets running away after 1 minute, etc.
Also, this has nothing to do with the 90 talents, but: i miss living bomb spreading a whole lot.