Sketching is a great way to capture ideas on the fly and problem-solve together in a meeting with peers or a client. You can capture much more information via pictures than with text. Sure it takes practice, but so does note taking or any other skill. But the end result is a memorable visual description of the conversation as it evolved. Not to mention the fact that the faster you write the worse your handwriting gets, and if you are like many people in this digital age (self included) your handwriting is fairly illegible to start with. Even being familiar with your own handwriting, you may find yourself scratching your head later trying to figure out what on earth those words are. I know I do. Whereas with a zippy picture the meaning doesn't disappear just because some of your lines get sloppy. Remember - we aren't talking about creating "art", we are talking about capturing ideas, impressions, observations.
Perhaps anticipating the response ("I can't do THAT!"), Amber made a point of saying that she didn't take a bunch of classes to learn how to sketch so fluidly in front of a group. She said she practiced. And practiced. And practiced. She forced herself to sketch all sorts of things. For example, Amber advocates sketching meetings, not only as good practice, but because you will pay better attention. Remember some deadly dull meeting you have been in when all you could think of was how much you desperately wanted a roving espresso cart to appear in front of you. Then think about how entertaining and productive it could have been to instead have sketched the players in the room and what they were saying. Fun, no? Lasts longer than a latte too.
Be careful however. Perhaps the first few times you should go to the store with both a sketched list and a traditional list. Until you learn what your own sketches mean.
Otherwise you might come home with ... things. Really odd things.