Even so, I think there's a lot of value in taking the time to hear the words rather than just reading them. Speaking from my own experience, I have a habit of reading entire sentences at once. Rather than letter by letter, word by word, line by line, I'll immediately scan the entire sentence for key words, and then if necessary, I'll go through it more carefully and search for adjectives or other conventions to help me understand the situation. Sometimes, I'll scan for keywords and think "not important" or "still describing the outside of the house...irrelevant" and skip ahead without taking the time to work through the actual text. All of this happens in a matter of seconds and consequently I'm able to read very quickly through large documents and novels rather than picking up every single world.
While this works well for me, I also know that I'm missing many things. I'm able to pick up the plot, but it's easy to drop the tone, and miss out on the imagery. I see the dialogue, but I may miss the more subtle actions which occur before and afterwards. I find that when I have the time, and when I actually sit down a read a section word for word, it's much better than I thought and much more detailed...and also takes so incredibly long to read.
That's why I like to force myself (and the students) to read out loud for certain works. Granted, it only really works for plays and scenes with lots of dialogue, but it's still a chance to force yourself to hear, listen to, or read every single word for a change. Sometimes that simple shift in perspective can give new insight into finding gems you never knew where there.
Well that, and it's also fun to read To Kill a Mockingbird in Frank Underwood's voice (House of Cards).