Workshop + vineyard is definitely thing, in the same way workshop + gardens is a thing.
In both cases you'd much rather have ironworks, but sometimes you get what you get. The difference is that vineyards tends to favor the long game much more than gardens. (its nearly impossible to get your deck up to 70 cards, for example). So yes, on a slow board like the one in question, vineyard is quite good.
I've seen much better boards for it (say with caravan), but good actions are less important than the speed of the game. If you get most of the vineyards and the game is slow, you win.