A lot of these diseases don’t kill you, generally. I think smallpox was the biggest killer, and I think that was the first vaccine developed. So, in terms of world population that is probably the most important one, I doubt most of the others would have a noticeable effect. But of coursed they have saved people from much suffering, disability and yes, to a small extent death.
They don’t vaccinate kids for small pox anymore. I suppose the disease is no longer a threat? They vaccinate for chicken pox but not small pox.