you won't have huge security lines in the E-terminal. they use a system where you have green (waiting) lines if you have enough time and others where you only have access for flights departing soon. and if you are elite, then you can use the elite line for security. so since you arrive in E and leave in E, there won't be much of an hassle. just be aware that some gates (E) are in the S3 part of the E-terminal, others (E87-94 I think) in the 'old' E-terminal part and you have to take a short commuter train between those. really not a big problem