I think part of this is the often dual use nature of these machines. Gaming consoles have updates every couple of months, which might be more often, but the systems are also left on or left in a low-power mode where they will still check for and download (and possibly apply?) updates, depending on how the power settings are set.

If you used a gaming console the same way you are using your main computer (booting it into a separate OS for most the time, until you all of a sudden wanted to play a game) you might also find that there's updates waiting to apply, and some games require the OS update before they'll play, etc.

I feel like I'm the only one that still shuts off the PS4 after I'm done. Why would I let my console run idle for days, consuming power that I don't need? If I want to game, I turn it on, make my dinner, go to play.

I get the same thing with my ps4.

Yep, I miss the PS2 days when you just put a disk inside and play for the whole time you're in front of the console..