I cannot disagree more. I have a Shoei Qwest which is considered a very quiet helmet, but it in no way keeps out enough wind noise to be as effective as it needs to be. With ear plugs you can still hear effectively - no doubt you may not be able to have a conversation at a traffic light and the bikes running, but it's a small price to pay for not loosing your hearing or developing bad tinnitus (which I have).
Like I said in my post above, I did ride for many years without them. You'll realize how much you need them if you ride for several weeks with them in the entire ride, then do a ride without them. You will realize then how much of a difference it makes. I seriously regret that I fought it all those years.