This has been brought up, but I want to add my voice to it as I feel like it's very important.
Separate lines for one-day badges. My boyfriend showed up to the con in the early afternoon on Saturday, and wasted more than 2 hours in line when he only had that day to be at the con. If a person only has one day, they should be in line for their actual ticket/badge for as little time as possible! Long lines for full weekend passes are understandable, and there's tons more time to enjoy the con. But I was very upset that my boyfriend had to spend such a big chunk of the day in line instead of hanging out!
I also hope to see returns of printed schedules, or at least pocket schedules. I have a smart phone now, but I didn't last year, so I was stuck without a schedule all weekend. It really put a damper on my con, and I usually love Fanime!