but that is really NOT the case ---- I always remember the presenters that did an outstanding job along with the mediocre ones that clearly just wanted to get it over with and took a casual approach.

Public speaking is a very important skill that shouldn't ever be taken lightly or approached casually. At least half my career is due to my ability to speak in front of people - it is the best and easiest way to impress your bosses - you don't need to be particularly hard working as long as you take advantage of every chance for exposure (trust me on that ). lol.