In a lot of cases, so far in my career, using iostream's and sstreams and fstreams in C++ is absolutely fine because most of the programs time isn't even spent there, it is spent in the data crunching algorithms.
I am a real world C++ programmer, I can only claim about 5 years experience though, and I use iostream. So yes, your data is anecdotal, so is mine, and we are both complete opposites.
Raw number of years of experience doesn't mean much. I've seen developers who started using C++ in the early nineties, but haven't bothered to update their knowledge of C++ since then. If I have more years of experience than you, does it make my opinion more authoritative than yours?
