I will offer a different perspective. I have traveled internationally 1-3 times a year for the last 15 years, and about once a year prior to that for another 7. I also traveled domestically for business for about 10 years, the equivalent of a couple flights every other week.
I did get Precheck, mainly to keep my shoes on and not to have to pull things out of my bag, it was well worth it. In Retirement travel, it is "nice" but not a deal breaker. The process was easy, do the forms, then head down to a local office for pictures and fingerprints.
Global Entry however I passed on that. Why? Arranging the in-person interview was a pain, I would have had to travel several hours (I fly out of a regional airport) or try to fit it into a travel itinerary, so the pain of the process was more than I was interested in. (Know several others in my business and area that also tried, and gave up as too much a hassle)
Based on my experience, what would GE have saved me? Not much. I fly back through places like Detroit, Minneapolis, and Atlanta (Delta if you can't tell) and into terminals that are largely Delta volume. I maybe wait 10 to 15 minutes at most, less now that some places have the kiosks. In the cases that the GE folks have made it through quick, they were stuck waiting for bags with everyone else. At times, I have beaten the GE people through (I took it lots of people who do not travel often and were trying to figure out the kiosk). So for me, don't have it, don't miss it, if I get through 10 minutes faster? I am just waiting longer for my next flight.
Now if you fly into one of the nightmare airports regularly, especially as your final destination, and you only do carry-on on the way back, then yes, you can make a case that it will save you time; and if you travel more than once or twice a year, then that can have value.
If the application process was as simple as precheck, sure, why not. Consider also, with Facial Recognition, e-gates, pre-loaded traveler information and the like, lines keep getting quicker, even as volume increases, basically "GE" for everyone is coming through better technology...heck, even made it through immigration at Heathrow in 10 minutes using the e-gates.