Do I need to use the ESS machine each time I enter the Shengen?

I used one of the ESS registration machines for the first time last week. My understanding is that the machine is only for initial registration, and that I can now directly go to the egate for entry and verification.

However, it seems like the staffs at the airport just redirect everyone to the ESS registration line.

Am I correct that for my upcoming trips to Europe I can skip the line and head directly to the egate?