I'm new to digital photography. I've got a 20d, paid very good money for it and it has many features. For events, like dinners, weddings, etc. I tend to use P mode as it takes alot of guesswork away. I just like taking casual snapshots and I leave it to the pro photog present to capture all the serious, must have shots. I love having fun with my camera and enjoy whatever features it has to offer me.
However, for serious shots like studio work, then I go to M. For outdoor creative shots like macro, I go for A or Tv mode.