I just found out that the update to Safari 9.1.3 comes along for the ride.
Thanks for that info, I hadn't noticed. I did, however, notice that very long restart that you mentioned. I brewed a cup of decaf coffee and sat here and read. 
The only oddity I've noticed is that my Amazon Music downloader launched and wanted to re-download ALL of my music. I had to force quit the application to stop it.
Still, I shouldn't be surprised as the Amazon apps have never played nice with my iMac (they often install the updated app on my desktop and then I wind up with two copies and it's all kinds of problems fixing it all).
I read about this in iOS, and I actually went and updated my very old iPad just to be safe. I never go on the net with it, I only use it to play music for my morning alarm clock, but better safe than sorry.
Thanks for the info, Jon.