You certainly should not be calling for it just after lift off, but 'bug up one click' is nice at say 500ft, when you have done a flap 15 takeoff, want to go to flap 5 (to get rid of some drag) fuel)and leave the flaps at 5 for a while, as in a close-in 180 degree course reversal. No point in accelerating to some higher speed while heading in the opposite direction to your destination. Also in amongst rocks etc you might want to keep the turn radius down until near outbound track, so the 'bug up one click' does have its uses. Otherwise it wouldn't be an available feature?.