It's a good thing you're thinking about the meaty stuff, a lot of people don't give a thought to the big question: the meaning of life. Yeah sure, it's a cliche 'deep topic' but that doesn't take away from the importance of such a question. There's only two possible answers: either there is an intrinsic meaning to life and we have to 'find it' or 'stumble across it' or let 'it' find us; or there is not an intrinsic meaning to life, and we just have to make up our own.
I'm personally for the former (objective meaning), and think the latter (subjective) plays a secondary role. But that's tangential from your topic. I've heard some people's response is to ask 'out into the void': "If there's a God out there, and you exist, show me the meaning of life." You've nothing to loose by so saying, only the possibility of gaining - but never in the way one expects.
Even though too much thinking can make one mad, it's better to be a seeker than one who folds in the towel of life in immersing themselves thoughtlessly in an unexamined life. As Socrates said: "The unexamined life is not worth living." Even though I might add, the examined life can bring greater burdens with it, this is only so because it brings a greater sense of depth to the experience of living itself - thus the highs and the lows are felt ever more keenly. Still, down time is necessary, spent just doing something, like a hobby or reading a light fiction book, or watching a film - these are often said to help pacify the mind.
So, an ENTP's ticking mind, a curse or a blessing? In my view, a blessing in itself, but it can be used as either a curse or a blessing - a curse if it's used for the ego, and a blessing if used for the pursuit of what lies on your heart and in your conscience, even if in such pursuit it feels like a curse.