I don't remember having to queue at the section where others were applying for extensions. I do remember it took me longer to get there than getting my visa transferred to my new passport.
I'm from Argentina and I don't know of a single case that weren't able to do a visa run and stay for another 90 days after being a few days away. The ones that got declined were living in the country illegally.
Argies are still getting 90 days after 90 days after 90 days. Every now and again a custom officer will ask for an onwards ticket and a few got declined right before COVID as they had been living here for years. As for right now every case I know is entering and doing border runs without issues