“I always wondered how Picard was “sane” after living an entire lifetime in 20 minutes, having kids, grandkids, etc.”
He kept trying in later episodes to master the little Recorder, or Flute, or whatever that thing was, that was given to him as a remembrance of that life.
My opinion was it softened Picard some afterward. He saw life from the side of actually being a father, and grandfather, which he would never get to experience in real life unless you count his time in the Nexus.
If I remember correctly, the flute didn’t actually work in reality. It was auctioned off some years ago, for a considerable sum.