You're wise, R., to put this question out there, especially since you've already gone through the highly invasive surgery once. Keep in mind, "degenerative disc disease" is NOT a death sentence. And it certainly does NOT always lead to surgery. There are people in their 20s and people in their 80s who walk around with it everyday and don't have a problem with it. It depends on your severity and your body's particular response to it. And, if you go to a surgeon (neuro/orhto), they are in the business of recommending surgery. If you go to a pharmacist, they give you a medication. It takes going to a well-educated, well-experienced, doctor of integrity that will do what she/he is sworn to do = act and advise in the patient's best interests, not for personal gain.
And, I know you're doing your homework on this...you'll also find that the percentages of successful back surgeries are now around 48%. That means the chances are greater that you'll come out of there (and after the 6 months re-hab) just the same or worse than when you went in. Now, this also means that some people benefit. When surgery is absolutely indicated, I'll refer patients for it, no question. It is not about my ego, it's about their needs. I just encourage you to seek other options (if your case is non-emergent of course) available to you, particularly since you've already been through this before (i.e. Spinal Decompression specifically designed to treat DDD, not just the symptoms of it).
My 2.5 cents :)