I agree, but one good thing about starting with the soft and boring parts (like your name and credentials), is that it's easy to do when you're nervous in the beginning. Can't really stumble that too much, and then you're warmed up for the real talk. But of course, the shorter you can keep it the better. Instead I often try to memorize my first lines, word by word. Then I know I will nail them when at my most anxious, and then the rest can be talking more freely.