I had a C4/5 spinal fusion last July. Like said before the graft site was more painful than the neck incision. Also had a discectomy at the same location you mention, just not the fusion, in '06. Took about two months to get back on the bike.
I'd highly, highly recommend doing some type of core strengthening exrcises amd by all means, get heaps of good phyiso after. Pilates, yoga, whatever.
I am glad I had both procedures. I am pain free my friend, imagine that!
Good luck and keep us posted...
Ride, eat, sleep, repeat!
Bookmarks