My poles are part of the lightweight solution, for me.
I have the gossamer gear LT4s (short) at ~3.5oz each. I use them almost all the time while hiking, although occassionally I do need to carry them (usually if I'm actually clambering up something, or more likely clambering DOWN something very steep). During those times I will hold both poles in one hand, and sometimes switch hands in mid-climb - given that they are so light, this is not an issue.
Poles are also one of the most multi-use items in my gear -hiking, stream crossings, tarp poles, stabilizing my camera, waving at stray dogs, even picking up dirty trash (last trip included picking up & packing out a soiled pair of underwear, a dirty broken berkenstock, a rusty food can, and several clumps of used TP from the AT in Massachusetts, yuck).
Finally, I find myself 1) being less tired at the end of the day and 2) being able to move faster with the poles than without. For me, this more than makes up for the 7oz of weight... they are not an additional or luxury item, they are simply part of my "hiking system".