I typically pluck old needles that are ready to fall like Graydon mentions, and then cut the rest. I do this as I can be as fast as plucking, and yet I can be more cautious to make sure I do not damage the trunk.
With larger ponderosas I typically use my standard shears. With the smaller trees I have gone to using a pair of scissors from my fly tying days that have a D loop that my right ring finger goes through, and the scissors rest in my palm. That way I am free to use my left hand and the thumb and first finger of my right hand to manipulate branches, needles, buds, whatever and have the scissors in hand to instantly cut needles when needed. Due to the precision nature of these tools, they need to be cleaned about every tree to remove sap, and they have diffiuclty on large thick ponderosa needles. Works for me and makes things go fast through...