I was going to say that most of the panels I've attended (not many since I spend most of my time working in the dealer's room) have started relatively on-time.

But then I remembered that most of the cons I go to with the booth I work for are fairly high-profile have been running for ages and are actually organized.

Except for AnimeNext. Relatively high-profile in the area, running for years, but almost every time I've attended/tried to attend a panel there it's been some level of clusterfuck.