I have accompanied my DH on several trips to the Gartner Group conventions at the Dolphin...it is pretty amazing how they feed so many people in one huge tent, house everybody, have seminars. It is a big to-do!
If you are going to be there, you will mostly like be impacted only if you are staying in the Boardwalk area, especially at the Swan/Dolphin. If you don't have a reservation and want to stay at any boardwalk hotel during that time...GOOD LUCK. We made ressies for the conventions almost a year in advance to get in.
If you already have a ressie, I wouldn't worry too much. Lots of techie people walking around with cell phones etc. but no big deal. If anything, it will make you feel glad that you are there on vacation and not "working".