I am a very visual person. When following instructions, I would rather look at the pictures and then, when all else fails, I will read the instructions. I am an impatient person and to have to read the instructions for 3 minutes or just look at a picture and get the same idea in 3 seconds, works much better for me.
Also, I find that reading instructions can be very ambiguous and therefore very confusing. As they say, "a picture is worth a thousand words."