All engineers are super fun people! It's a shame more folks don't know that.
On the whole, the work/life balance thing has flaws and merits, although I'm specifically factoring in the cortisol in the brain which can block the free flow of ideas and easy thinking. Too much cortisol build up would mean that you're basically giving yourself a thinkers block. Fun things can encourage the release of serotonin, which stabilises the mood and will help you think clearly. And then BOOM! Things will make sense easier and you'll find your answer!