Somebody said this the other day (mentioning Vettel). My reply was as follows, although this person was actually talking about drivers winning races in every full season they competed in rather than just the first:
And Fangio (although technically he never raced a full season anyway because of Indy, discounting Indy he had many complete seasons plus a few lone races at the end of his career), Ascari (he only had 2 complete seasons, again excluding Indy), Hawthorn, Moss (who can be counted whether you discount Indy or not, on account of 1961 not including Indy) etc. Probably several more drivers from the ’50s in particular. Prost and Senna too despite very nearly having complete, winless seasons. These days it is of course more difficult due to virtually all drivers starting in weaker cars and being committed to full seasons in them, so, even if there are loads of drivers who have won in all of their full seasons, Vettel being counted among them is impressive nevertheless. Schumacher is a recent driver who ruined being counted due to his comeback.
And as I said, those are drivers who won a race in every full season. If you are only looking at their first full season, and depending whether you discount Indy, there will be plenty more.