I agree 100%. I did this to my LX last summer, both high and low, and it made a huge difference in light output.
I also did two things to complement the Relay Mod:
1. Added good bulbs - I used GE Nighthawk 9004s in OE Ford Housings
2. I re-aimed my headlights. Correctly.
The car is much nicer to drive at now. I think the lights on my notch are as least as good as the ones on my 2010 F150.
91 LX coupe - GT-40 intake, GT-40p heads, Lentech AOD, 5-lug swap, bunchoftherstuffIdontrember - 13.59 @ 102.6
2010 F150 4x4 - stock and staying that way