I had a root planing almost a year ago and it was the best decision. The deep cleaning really works, my teeth feel cleaner to my tongue than they have in many years (I am thinking 20 years).
My gums had 4-5mm deep pockets filled with plaque, now they are 2-3mm deep. My teeth are much less sensitive to brushing, and hot and cold liquids since the gums have reconnected with the teeth and gone back to where they should be. Now, I floss nearly everyday because I understand how the plaque accumulates over the years, leading to tooth sensitivity and pain.
My gums bleed less after the root planing. On that topic, if your gums bleed often, you may be vitamin C deficient. Vitamin C taken three times daily over a two week period helped stop my gums from bleeding, and my dentist did not tell me about this.
Anyway, the root planing is well worth the cost. I literally feel much better now after the root planing with tight gums that no longer bleed when I floss. It is fantastic, almost like magic.
However, I would not have it done with a metal pick/scraper. My dental hygenist used a sonic cleaner with a topical liquid anesthetic that required no shots. She just spread the liquid over the base of my teeth as she worked on them and she was able to work without hurting me. When I felt discomfort, she reapplied the topical anesthetic. It was great, fantastic, and well worth the cost.
I highly recommend having the work done, so long as the sonic cleaner is used. You do not realize it now because you are used to the feeling of plaque on your teeth, but you will feel great afterwards and very happy that you decided to have it done.
Typical cost is $900-$1200. My work dental insurance through MetLife paid for most of it.