I don't bother with going to E18. I'm satisfied with expedited screening. There is a separate line and it's usually very short to the ID checker. You just have to show your BP to the screeners and they'll ID you as PreCheck. Only have to remove laptop, otherwise no difference from regular PreCheck. Sure, you do have to wait a tiny bit longer for the "regular" people in front, but it's not that bad. What you lose in the 1-2 minutes waiting in line is much less than the time it would take to take Skylink from one end of E to the other.
What is annoying is the fact that the screening area is positioned such that the escalators closest to the rental shuttle dropoff are closed so you have to walk down farther to go up and then backtrack.