We just returned from a trip starting in Barcelona on July 3 and leaving in Paris on July 23. Here is our experience with the EES systems at Barcelona and Charles de Gaulle airports.
Barcelona arrival was mid-afternoon at 2:30pm. The lines for Passport Control were crazy long down a long hall. The lines were split into EU passports, Non-EU passports families with under 18 children, and Non-EU passports 18 and older. The family line moved slowly and was almost as long as our adults line. We were in line for about 40 minutes. Once we were to the "kiosks" there were people helping you through the process on scanning your passport, taking your picture, and scanning in your finger prints as well as answering several questions. This took about 5-6 minutes per person. Then into another line to go through the "e-gates" that scan your passport again and take your picture. We waited about 10 minutes for this.
Paris Charles de Gaulle departure was a 1230pm flight in Terminal 1, so we got there early not sure what to expect. Passport control is before the security screening here. The lines at about 10 am were fairly light. The lines were split into EU passports and several other countries including the US together. The other line was for all other Non-EU passports. Our line for EU, US, etc...was about a 15 minute wait (I would say this is about the same as before those lines were mostly 10-20 minutes in the past). We did not use the kiosks, but I am unclear if on exit that is needed. We just used the e-gates that again scanned our passport and took a picture. The Non-EU other passport line was quite long. Security screening lines were super fast after we made it through passport control.
I do not know how representative this is of the operations at these airports and how they will continue to operate, but I thought some information is better than none.