This is typical of the behaviour of many tech/software companies. Apple, for one, is notorious for making forcing unwelcome changes on users. For example, when they dumbed-down Pages to the point of uselessness, they aggravated countless business users who then had to purchase alternative software because Apple had decided to "improve" a perfectly good product. However, it has a customer base which has heavily invested in their hardware and so has to be pushed very hard indeed to turn to other providers.
Without this security Evernote is skating on thin ice when it messes around with the interface like this. Personally, I had no idea how much I actually used notebooks at all, rather than just searching by tags, until they made this change and my workflow was slapped down by the idiotic new single-colum list they decided to impose. Why the hell did they think that it would be more efficient for people who had got used to having a big screen will all notebooks visible at once to have to scroll up and down trying to find the right one? If anyone from Evernote is actually reading this, please consider this point:
Serious users of any software do not value change for change's sake. We want to work efficiently. If we don't like something we will tell you and will appreciate it when you listen. If you have a great new idea than tell us and we'll probably love you for it, perhaps even pay you more. We remain loyal. But messing around with major parts of software UI is like sneaking into users' offices while they are out and rearranging their stuff. We do not like it at all if you encourage us to work a certain way and then suddenly make that impossible. We can — and will — take our money elsewhere if you make that a sensible choice.