Whilst I agree that it is very different, the fact is that if you fly 800 hours a year on a jet in northern europe, you are a good deal more current in real instrument conditions than the average single pilot IR holder.
I do actually maintain my single pilot instrument rating, although I hardly ever use it for real. So I think I am qualified to say that it depends.
As an aside on my last checkride I was amazed how long it took to fly a departure I regularly fly in my 737, the difference in pace is amazing even for a mooney!