I have a compact set of Minolta binocs that can't weigh over 8 oz. If I'm going somewhere that the trail or climbing route is visible, like the main trail on Whitney, I'll carry 'em and scout the trail ahead. Did so on Whitney, was able to see much of the switchback area between Trail Camp and Trail Crest.
Didn't use 'em other than that, and given the "easy but steep" nature of the Whitney trail, they were of marginal use.
On the other hand, when I've been climbing other peaks, I have found them very useful to get a better sense of off-trail routes up even relatively easy peaks.