I walked around at sharkfest in 2011 and got to chat with a lot of wireshark users during the picnic lunches. What struck me as interesting is that so many people use wireshark that are not network professionals by trade. They are poking through it, trying to just find a clue or two to see what the issue of the day is. I think that's wonderful! That wireshark is accessible enough with the gui to let people who are not diehard packet geeks really take a stab at looking under the hood and having a go at it.