The larger reason I have my lights on is so that others - those without night vision goggles - can see ME. I live in a city, so I can see fine without...but not a chance I'd go out there without them working.
If you want to save power/alternator drag, switch everything over to LEDs. I'm quite pleased with my ~$20 ebay LED headlights; they're about the same brightness as the power-hungry halogens but only use 1/4 the power. All bulbs converted over only pulls about 5 amps. You can go alternatorless if it's important enough.
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