Live view is exceptional on the 5dII, there is no reason to pass based on shallow depth of field.
You are right and Live view has saved quite a few shots. It is more usefull than I expected when I got the mkII. But most of the time live view is too slow and/or I have to look in the display making the camera less steady resulting in motion blur instead. A tripod is not a good idea on a dancefloor for instance.