I find show room visits are often worthless too. The dealers rarely have demos of all the stuff they sell. You listen to a speaker, like it, and wonder if the larger one from the same manufacturer would be better, and by how much. Also, dealers want to sell product, and are not interested in your little research project.
All in all an industry show is most useful, at least for a start. But CES seems to be mostly about non-audio things. And, to attend, you are supposed to be in the industry. What do I do? Print myself up some business cards..."Audio Consultant"?
The location of the show is not too big an issue. Southwest Airlines will take you most anywhere for the price of a few CDs.