"Need" IMHO is a bit of a strong expression.
That said, Chalk up another one for the pro-poles crowd. Fully understanding that it is a totally personal preference I would not even BEGIN TO DREAM of any hike without my poles. Even of the flat of the flattest they help me with my balance, posture and in some way load distribution.
My wife on the other hand really does not like them. When she joined me to do SdC --> Finisterre, no pleading of mine (being the "wise and experienced Pilgrim" now after hoofing it up the whole 800km
) would change her mind...
..That is until she encountered some of the initial elevations and meekly accepted one of my poles that I offered. She found that it helped. (She still insists that she does not need a full pair for all of the time, but I think my case was proven)
Good luck no matter what you decide.
P.S. Click-clacking noise... I'm slightly confused. The only time my poles did so was when i TOOK the rubber tips off and thus exposed the metal points. So.. what am I missing here folks?