With the introduction of EES system (whose implementation was completed only a few months ago), the full data of non-EU citizens gets collected the first time we enter the EU and then we have to verify it every subsequent time.

Not much of a hassle at airports due to the availability of self-service kiosks, somewhat of a hassle when crossing with a car, and infuriatingly annoying when using a mass transit option like a bus or a train where everyone has to step outside and wait in line to do that, adding about 20-30 minutes to the border crossing.