Sound advice. When I flew in the RAF we used landing and/or taxi lights when at low level. Studies show that birds don't like moving lights and tend to get out of the way.
You'll hear the same thing about using radar...it doesn't make any difference, either. You should use lights down low for a much more significant collision hazard, however; other aircraft.
The truth is that even with a very large bird, the chances of doing significant damage at Cherokee cruise speeds aren't high, and you aren't going to be landing with an uncontrollable airplane or no visibility. Yes, in the event that you are disabled due to the condition of the aircraft (or you), then you're fully justified in taking any action you deem necessary at the time.