Well, you experienced EES whether you know it or not. Many people seemed to be confused as to what "EES" is, it is just the electronic entry and exit system, and can take many forms. The main idea is to electronically record your passport scan, and then usually some secondary method (face recognition, fingerprint, visual by an officer) of verifying that the person holding your passport is you.
For the most part, what you can expect on exit most of the time is the use of an e-gate, you scan your passport, there is a camera recording you, you might have to look at a camera, and out you go, no stamp, all electronic. The e-gates can also ask for a fingerprint scan (but usually not). Conversely, I have also been processed manually, by a person, where they scanned my passport, they had the capability to take a picture or scan fingerprints, but did not need to do it, and that was still EES.