A coupl'a thingz . . . .
I just flew CDG/ATL/ORD, and security after customs was empty - but this was in the evening, as DL29 arrives pretty late.
I guess it would depend on whether or not you arrive at terminal E or F. If you arrive at E, you hafto walk ALL THE WAY to F for immigration/customs and exit - which is a ridiculously long walk. If you arrive at F, it might make some sense. Do any airports have PreCheck post US Customs & before continuing to a connecting flight?
ATL does have a SkyPriority line before security post US Customs. When I was there recently, there wasn't a sign, but I was directed to a particular line for it.