No, it has just a few concepts that if taken seriously (i.e. don't try to write imperative/prescriptive code) will lead to the natural discovery of many of its other features (or you'll end up inventing them yourself).

I am talking about continuations and workflows -> these concepts are not that straight forward, especially if you are coming in from imperative programming background.

Fair enough. What I mean is that F# (and Haskell) can be useful without knowing about Workflows (and Monads). By the time you find yourself needing them you'd either invent them (fairly easily) or find them... It's not much harder than INNER JOIN in SQL which I also think most people would eventually invent if the language didn't have it.