Eh, it depends a bit on the boss and the timing. For example, the Alterac Pass boss isn’t all that strong for pushing with, but it makes a great distraction as the objective is coming up, so the enemy team has to decide whether to send someone to prevent their keep from losing the outer wall, or preventing us from taking the objective.
Sky Temple is another map where I don’t mind letting the boss do its own thing some times, as although it is fairly strong, so are the objectives. And fighting on the bridge of death is always scary, even with the boss.
On a map like TotSQ, yeah, push with that bad boy.