Well, you won't like my experience, but I had to have the fusion. Stupidly, I got back on the bike too soon, and now am having instability in an adjacent disc. Massage, specifically trigger point release, has been a Godsend and my arm/delt problems are gone, for now.
When my ortho went in, he found the discs were much worse than the MRI showed. I had one disc slammed against my spinal cord, so it's good I had the surgery. You can be asymptomatic, but the problem will still be there, even with steroid injections. BTW, I've had several steroid injections in my lumbar spine & they didn't make me fat, aggressive or anything else. I don't think you get enough steroid for a long enough period to have those problems.
I also suggest that we cyclists have a much higher pain threshold than the majority of the population. My ortho seemed to think I should have had a lot more pain, looking at my cervical spine, than I experienced. So, I think it's important that we really pay attention to these problems.
I do ride my road bike, but my current limit is about 2.5 hours. I'm having lumbar problems that limit my cycling. Lumbar & cervical problems seem to go hand-in-hand. Be sure your core is strong.