I only use headlights for a few things these days and have really learned to hate them since I started doing SAR work. There's only so many times a person can handle having his night vision ruined by a dude with a headlamp.

If you're patient, and the moon is out, you can usually go pretty far into the night without needing any light. Once you use it though, night vision can take up to 40 minutes to come back.