I really don't agree with you about the scale of the world.
The game is real time when it's up to movement whatever the (missing) in game clock is saying.
A usual character run at +-10km/h and our characters are running in real time. Let's say 7 or 8 because they're not running really fast.
You don't need 1 real time hour in game to go from one side of the map to another with real time running characters so no... The map is absolutely not as big as you imagine it is.
And in BG1/2 I could cross an entire "zone" in under 30 seconds - no relevance to scale.
In the Druids Grove, look at the number/size of trees, outcroppings, terrain features, caves, rooms, tents etc....it's a fairly large area - to fit your perception of Act 1 covering just 1 or 2 km, Druids Grove would be the size of a small house and yard - a half acre or so.
Maps in the old BG are small, I think no one ever said something else... But there a way more maps than in BG3 and you travel between them.
You never see what's between maps and that's why the world feels consistent.
You just explore small areas everywhere on the swordcoast... You don't explore the only 1km2 where everything is...
You really have a problem with scale...
The scale of every room is fine if you look at characters and items. But if you have to walk 30 sec in real time to cross a forest, whatever the size of the trees this forest is still only maximum 75m long.
The scale of everything is fine if you consider things individualy. But the world is still very small and every events are one upon the others.
The goblins unable to find the grove is the most representative and concrete exemple about the size of the map problematic and why it does not look really consistent.
That said you can live with that... But even the story has inconsistencies because of it