(;
flying online, i wish someday i'll have to face that.

In FS world? Routinely, in the right time of the year.

 

In real world (as pax)? Just once, but I dont fly often and even less so in fall/winter months.

You can start off light by going into EGLL right now, there's a bit of mist how ever not that bad (at least not at the moment).

Well yes... I have been in Microsoft fog coming into Denver, looked all clear and I could make out the runway in the distance, 3 seconds later I was in a thick soup of fog that didn't dissipate before 150 feet above the runway...

If it is really bad, thats when you really pull the autoland out of the bag.

That is a kind of a "bug" in FS. In real world occasionally happens, but by no means as often as in FS.