Nice article, thanks.
I haven't had my ereader long enough to truly appreciate it as a "library in my pocket". I have perhaps 40 books or so on it now, but I've only read a couple of those as I have been finishing my paper stack.
I do, however, normally consume a fair bit of non-book reading material online, and my ereader has become important in that respect. I now use Calibre to convert a few science and news rss feeds into ebook/emagazine form and load them on the ereader. As well, when doing online research I now simply put articles of any appreciable length into my Pocket.com account and sync to my ereader (kobo). It is a huge bonus to offload a lot of necessary online reading to an e-ink device that is more comfortable to read with and which I can take with me anywhere, regardless of connectivity.
Indeed, I now read more online material for pleasure as well -- articles and prose from tor.com, longreads.com, and edge.org for example. Stuff I have often bypassed as I already spend too much time in front of a computer screen I now also just Pocket and read on the ereader (when taking my mother to the doctor, getting an oil change, and soon (but not soon enough) while sitting in the sun on the balcony and having a beer)