After a couple of weeks, I think I finally realized what I love most about widgets (and this does relate to third party widgets, so bear with me one second)...it will really be about cleaning up the main home screen.
I think like most people (maybe not on here, but MOST people), I have about 100 or more apps. I placed them in 20 folders only so I could have access to all on just one screen. It's changed a little bit over the years, but not by much.
Now with widgets and the app library, I find myself using three screens now of the most common things I want to see at a glance (I'm sure this will change), like clock, weather and calendar on my first screen...second screen is dedicated to news (Top Stories, Alternative Rock and Technology), third screen; battery, maps and music app. And then the app library, which I actually find to be quite smart in having my other regularly used apps within easy reach.
Again, I'm sure this will change once the tons of third party app widgets are launched (especially the ones I use way more than the Apple ones), but I'm planning on simply doing more smart stack options for similar apps. Just the idea of having a bunch of News widgets with separate topics I like to read about stacked has me wanting to do that one already.
I'm all ready planning out my smart stacks...social media stack, news stack, weather stack, sports stack...and I think the key will be to limit it to widgets that will actually provide some sort of useful info at a glance (I like the wide screen widget) so I don't just end up with 20 stacks in place of the 20 folders I had before...going to try and see how the app library works for me.