Hi Michelle,
We've been with Virgin a few times, and only went to the meeting once. It was the first time my sister and her hubby had gone along too, and they were worried they might not get some important information. Anyway, suffice to say we've all been to WDW since then and haven't bothered with the meet!
The time we went, it was held at Downtown Disney, and if I remember it lasted about an hour or so (possibly longer, i think I may have fell asleep

). They just tell you basic information about the area (which you'll already know thanks to these boards etc), travelling, the attractions etc.
Basically, with the travelling, hanging round waiting for the bus, and the meeting, it is a morning wasted which you could have spent in the MK having a blast...and there is NOTHING like seeing Cinderella's Castle for that very first time!
Just read thru these boards, post any questions you may have, sort your tickets out before you leave...then just get there and have a ball!
Have a magical time
Paul