Had a baby last year. Same boat as you. For non-Miami games, there just are not as many upsets and even if there are, it really doesn't matter. The the same 4 teams will be there at the end of every season even if they lose 1-2 games. I would rather spend time with my kid on Saturday during the day and at a good restaurant with friends at night.
For Miami games, I just can't get upset or have it impact my day anymore. Even during the Golden years, I would let the games really affect my mood. Last year during the UNC game, I turned to my wife and said, well that's a bummer, let's go on a walk to the park. I still follow it actively and make a point to watch every game, and waste plenty of time on here, but I am not nearly as invested as I was before.
I am with you on the pro leagues too. I did get into the Heat's run last summer, but generally can't be bothered. The only league I find myself watching in recent years is the Premier League if the timing works out.