I'll suggest that cruising the menu bar of every new app you launch to see what possibilities it offers beyond what you were expecting is more valuable than cruising System Prefs after each upgrade.
Changes in System Prefs will get your attention and get you looking sooner or later, but you'll never know what you're missing if you don't check your menus. (I used to have a whole laundry list of things to check to make sure they were perpetuated after upgrading, but nothing was ever out of whack, and I've gotten out of the habit.)
