Here's an App those of us WITHOUT Global Entry will find useful:
The Customs and Border Patrol have an App - available both for Android and Apple devices - that speeds up the immigration line back into the US. Here's an article on it from a few months ago that explains it better than I could. The first paragraph explains it perfectly...
We disembarked in Chicago and found the line for those with the Mobile Passport Control. There were zero people waiting. We walked right up, presented the passports and husband's phone that showed the QR code generated by the App. We were on our way in about 60 seconds.
Best part? This App is free.
Here's one more link - this one is from Customs and Border Protection and shows the airports where this is currently available. Also, there's also a question/answer section if you scroll down that answers many questions you might have.