I have to say I love the "power down" on my 3-point. I have a 3-point mounted disk with no accommodation for weights. Without power down it just bounces along if the ground is dry. With power down, it digs right in and does a great job.
I've also (rarely, briefly, and carefully) used power down to lift the rear wheels without a jack, and have considered adding a blade from a maul to make a vertical log splitter. And it's more convenient for popping tire beads loose than lowering a plow point on them.
So, I'd say it's nice to have the option. If you don't use it, you haven't really lost much.
Mark W. in MI