Making a quick sketch is one of the most enjoyable things you can do in a gallery yet very few people today seem to want to do. I now force myself to make a quick sketch at every gallery I go to but according to one member of staff I spoke to it is now a dying form of art. Today it seems that the iPhone has replaced the pencil/pen and sketchbook. This is a real shame as you only really start to understand a painting, drawing etc if you spend some time looking at it and this, of course, is just what you have to do to make even the most cursory sketch.
So next time you are an art gallery just see how many people are actually taking the time to make their own drawing/sketch of the art on display. I suspect the answer will be a lot less than you might think.