Mason's article on bunching

[belloc]

It's often brought up in a game like O/8, where there are more cards dealt, and only a handful of "good" cards. So, when you're in late position in an otherwise typical game, and six players limp in front of you, you can be pretty sure there are a lot of aces and deuces in those hands, which might help you make a better decision when it's your turn to act.

I've never seen bunching discussed effectively in holdem, but Mason's examples seem to be the right sorts of situations where bunching might help you decide one way or the other.