On headliners, you can get extra-long lines at park close from the surge of regular ticketholders getting in at close and the crowd of EEH guests thinking they will get a short line.
Waiting in a long line can eat up your EEH time, so try to be strategic about what attractions you do first.
Data point: I got in line for Guardians once near park closing and wasn’t off until shortly after 10pm on an EEH night when I wasn’t staying deluxe. So anyone who got in line at 9:01pm wasn’t getting off until after 10pm and using more than half of their EEH time in that line - at least on that night.