I enrolled in the EES app since I was going to Stockholm (ARN) - thinking it would 'enhance' the entry/exit process. Nope: both times (2x entry/exit) immigration checks have been extremely slow taking 10-15 minutes to complete (first exit took about 45 mins due to queuing - so was the last to board). CPH the other week was quick - a cheery check of the passport and a stamp, and it was done - no (evidence of) EES.