Other uses: pushing brush (blackberries, poison oak, etc.) out of your way down the trail (or bushwhacking), as a support for a variety of tarp shelters, as way to test depth and stability of creek beds and many more. One can be of use, but doesn't have the full mechanical advantage you can get with two, but two can be trickier to use if you are consulting your GPS, compass, map, radio, etc.. Ski poles (one or both), often available for next to nothing at garage sales, are an cheap way to test whether you like them. Trail hiking is different than SAR searching, so you may want to use them differently if at all on missions.
As is true across the internet, there is a lot of misinformation posted by idiots who fain to be experts and I ran across several of them in looking for a good source of trekking pole information This video is the best one I've found.