It's a note taking application. So a way to organize everything you would normally scribble on a piece of paper, or type up and print to have for reference.
So adding to my own thread, I realized while I was putting away my recent acquisitions, that this is a great way to remember what is in each of my binders and bags.  Normally, I end up pulling out each binder and looking at my pins, and pull out the ones that are supposed to go in it.  Inevitably, I miss one and have to pull out binders multiple times.  But then I can't remember which binder I need, so I end up going through most of them a 2nd time. This way, I can pick up a pin, look at Evernote to determine which binder I need, and grab the right one on the first try.
So on my phone, I created a Notebook called "Pin Binders."  Inside the Notebook, I have 3 Notes.  One Note for the 3 binders I've done so far.  So for example, one of the binders is WDW Pin Of the Month Series.  Then, in the Note, I typed which series are in it.  So for this binder, my Note says Piece of History, Find-A-Pin, Hidden Disney, etc.
Some of the series I couldn't remember the official name. So now that I'm at my computer, I can look it up on Pinpics, and then edit my note in the Evernote application on my computer.  And it will automatically update my phone.