At the other forums that I hang out on, the general consensus is that you do not have to automatically replace the rotors with each pad change. And, that turning most of todays rotors is not economically feasible....$10 -$15 to turn them vs. $25 -$45 for new ones. Many feel that today's rotors are too thin to start out with to justify turning. Of course there are exceptions.
The condition of the rotor will determine if you should replace it with the pads. You can measure the thickness to determine how much wear is still available and also measure run out if you have a gauge. Very light grooving is o.k.. So, the answer is "it depends".
Don't get all hung up on "ceramic" either. Most people relate the term ceramic to rock hard ceramic floor tiles. It isn't so. It's similar to people confusing "paraffinic" base oil stock with paraffin wax. Brake hardness and the ability to wear down the rotors is based on the entire pad formulation. Ceramic is just another type of filler in the pad makeup instead of metallic. A pad can have 2% ceramic or 40% ceramic and still be called ceramic. Many, if not most ceramic pads are less "rotor eating" than semi metallics.
Here's just one link that states "They handle heat much better than most nonasbestos organic (NAO) friction materials, and are quieter and kinder to rotors than most semi-metallic friction materials."
CERAMIC BRAKE PADS
Of course, opinions vary. I had to get over the stigma that the term "ceramic" implies. If you truly want "softer" pads, one probably has to buy the very cheap entry level pads. I have no idea how well they stop, but I certainly would not sacrifice performance and safety over saving a few bucks on brake components.
Finally, (still on my pulpit).......don't do just a quick "pad slap". Clean everything well and use good lubes. Placing a new rotor on a rusted hub might create run out, which will induce the "warping" sensation know as pulsation. Lots of other tricks to a good brake job, but I am jumping down off the pulpit before getting accused of being condescending and other things.