Oh yeah aint that the truth!Oh dear god, no. Not that stupid mode dial unlock button. To me, that's one of the most useless additions that Canon can put on a semi-pro body. I can see the reason for putting it on the 60D, but come on. Anyone using a 7D or higher should have some idea of what they're doing and in all my years of photography I've never heard of anyone accidentally switching the mode dial unintentionally. If the new 5D is in fact coming standard with the unlock button, I hope that one can "downgrade" and remove it. Even for a fee, I'd do it.
It depends entirely how you work. My experience with 5D and 5D2 has been constant, highly irritating, professionally embarrassing bumping of the mode dial. This primarily happens when working with two or more bodies. When I know I'm working in certain conditions, I routinely lock the mode dial with gaffer tape.
The lock is an essential and welcome upgrade.