A lot of people (guilty here too) have a very limited understanding, and mostly when I flew in FS9, I never filed a flight plan, unless I wanted to go somewhere where I couldn't eyeball it all the way.
So you like visual flight. You might be interested in Aerofly FS. I didn't have a look yet. But from what I have seen it seems to be the best option at the moment (for visual flight). It only covers Switzerland though.
As for filing flight plans: flight plans are actually an essential thing for me. No flight plans and ATC and no simulated world: good bye. But that's a matter of interests.
Just to demonstrate why MS Flight is literally useless for tens of thousands of MSFS customers...
This is my latest route from Frankfurt, Germany, to Boston:
For planning I use real high altitude enroute charts from Jeppesen:
Once the flight plan has been created, I have to create it once again in MSFS to get proper ATC instructions etc. And it has to be entered into the flight management computer (of the 767-300ER which I fly for a few years now).
Nothing works without the operating manual/performance charts (it actually would, but that's lame):
One another thick folder for all the airport charts from Jeppesen:
That's the IFR part.
The VFR part looks equal but just less complicated. ICAO aeronautical charts and the original VFR flight plan form:
My Piper Dakota:
So what does MS Flight offer?
Nothing.