I do have a comment. This is just my own observation after being on this site for a number of years. I have also had two spinal fusions. In my opinion, you should not have surgery, until your symptoms and pain are such that it is not bearable. If your MRI says cord inpingment or SEVERE cord compression, that is the time to consider surgery. Surgery is a last resort, when all other measures have been taken. by your own words the pain isn't so bad right now. That tells me, maybe your neuro surgeon is in a bit of a hurry. If three doctors say you need the surgery, well then I would consider it.
No, I don't know anyone returning to horse back riding in such a short time, nor have I heard of anyone going home the day of surgery. Somehow this doesn't seem right. Usually you are in the hospital for a day at least to make sure everything is OK, and to treat for pain if it should present.
Having said all this, even if you like your doctor, it would be good to seek other opinions.
My pain specialist, was the one who told me he could no longer control my pain. He was the one who told me I needed more surgery. That was my deciding factor.
Don't rush into this. Have you tried PT, and some kind of injections?
I am only telling you this as surgery is for the repair of damaged disks, and or structure, that says SEVERE in you MRI. Pain that requires alot of medicaiton, is also a factor. I hope all goes well for you silverfae, and that whatever decision you make is the right one for you. ginnie