I've never been to other job fairs, but I'd agree that the it's not just a job fair. The people that attend the WAI conference aren't all looking for jobs, which makes it different than the typical job fair.

You'll get lots of face time with exhibitors. When I went a few years ago, I had the opportunity to talk to any and all exhibitors without waiting in line. At the most, the representative might be already speaking with someone when you arrive at the booth, but definitely no formal lines.

If you're determined to avoid the crowd, just go to the exhibit hall during one of the popular sessions if it's open.

Worth the price, in my opinion.