Well.
Yes and No.
I am currently a player in two separate games that use the Realms map (they alternate hiatuses).
I would not call either of them games that use the Forgotten Realms setting though. For example, in one of them we started a mercenary company in Waterdeep. There are no masked Lords, there is only one noble house we are aware of (though it is implied there are more) there is a single inn, the guards are useless, stupid and lazy. There is a cave less than a days walk from the city, an abandoned church a bit further out.
Now, some of this may be accurate, some may not, but for the purposes of our campaign this city could be called Pittsburg and it wouldn't matter.
To me, this means it is not a Forgotten Realms game. I've tied my character to the Kingdom of the Many Arrows orcs, but most everyone else is either generic or homebrew and their backstories could take place any where.
If it is only the map we use, then it can't be the realms, because it is only place holder names. And digging more into the lore and actually making use of it is an amount of effort that this table is not going to make.
For a lot of people, this is what it means to play a Forgotten Realms game. Pull up a map and make everything else up, but for me, that isn't enough to be using the setting. And for all the effort I'd need to put into using that setting, I could just make my own. My players won't care because the setting never seems to matter to the vast majority of them, and I'm doing a whole lot less of guessing what the true answers are and how certain characters are supposed to act. These are my characters and my questions, so my answers are completely right.