Having more text on the screen means less page turns and allows you to go back a bit to read a previous paragraph without having to go to a previous page. (blog.the-ebook-reader.com)
That, ultimately, means less page turning, of course. (techcrunch.com)
Readers who are deep into the story don't consciously think about the words on the page, much less the pages in the book. (jamigold.com)