For people unwilling to invest in Global Entry, Mobile Passport Control [0] is a free program almost as fast as GE at the airports that support it. At the moment it's still sort of a lesser-known "travel hack" but it's becoming increasingly popular.

In my opinion though GE + TSA Pre is still worth it — the only thing better than the shorter preflight security screening is the even shorter GE kiosk line re-entering the US.

[0] https://www.cbp.gov/travel/us-citizens/mobile-passport-contr...