Who cares how long it takes to identify the target so long as the shooting doesn't commence prior to the target being identified. If you can't tell that the noise is Joe in his camo jacket then you sure as hell can't tell that the noise is a deer. Thus, hold off on the shooting.
If that works for you...fine. Personally when I hear a branch snap and then a minute later hear another one my adrenaline starts to rise and the sooner I can identify the source the better I like it. The orange "sure as hell" differentiates Joe from the deer.