Has anyone used USA-EU bilateral visa agreements to extend their stay beyond the Schengen 90 days?

My wife and I are American citizens. We have spent the past few months touring the Schengen area, and our "90 days out of 180" Schengen visa has almost expired. We have not spent any time in Spain so far.

We came across this website which mentions bilateral visa-waiver agreements between Spain and the USA which allow US citizens to stay an additional 90 days in Spain beyond the 90-day Schengen limit. The full official PDF publication is available here.

(There are also several other countries mentioned with bilateral US visa agreements, such as France, Portugal, etc.)

Has anyone made use of this? I'm surprised that I've never heard about it but it looks legitimate and official. We are aware that we could not leave Spain to visit other EU countries during this time period. Do you have to apply for it, or can you just go?

Edit: [here](https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:52019XC0408(02\)&from=EN) is the relevant info in HTML form dated 2019