After 3, two level Cervical Fusions with last one being both Anterior and Posterior, the plating on both sides, with rods and screws does limit some of my motion. I can still drive but use my mirrors much more to not cause excess pain by turning too far.
And for me, it's very painful to sit side-by-side with someone at a table or plane and keep turning my head to talk. I usually tell the person up front that I have had surgeries and if I have to look forward more, I promise I am still intently listening to them!
Also, I put a shower stool to be able to sit and shave my legs since the worst movement/action for my neck is looking down for a long period...so...I am limited mostly by pain, then secondly by the adhesions that have formed from the surgeries.
I do wear my neck brace, like now, when on the computer and at times to help 'remind' me not to turn so much and keep good posture to avoid more extreme pain later.