Speedlever
I really prefer it to the buttons. It is not as responsive as say an iPhone, but you must remember it is connected to a very slow screen technology the eink screen. Organizing books is very simple, not perfect but easy to do. It is kind of nice to have the book cover you are reading in color whenever you open the book. I have not had issues with tapping more than once for an action, it happens but no more than any other touch screen I use and usually due to pilot error
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The only drawback to it is the power usage, battery life is impacted by the touch screen compared to other ereader without the fancy interface. Not an issue for me I get 5 days of battery life and charge once a week.
The best feature of the touch screen is page swipe. For me I almost never use the buttons even when holding it one handed, I can swipe with my thumb and I do not have large hands.
Hope that helps, the power of a touch interface was one the selling points of the Nook and I was not disappointed.