Love them both. Travel a lot to Europe and the return flights through JFK or Atlanta well beyond easy. At some point, this may get crowded but I don't think I've ever waited in line more than about 5 minutes to use a verification machine and then it's virtually a wave through at the desk. No line.
The PreCheck stuff is a mixed bag. Most trips out of Cincy I'm glad I have it. I think there are about 5 TSA agents working here now. Other airports, the lines are sometimes about equal so no benefit for PreCheck.
The benefit for me is the predictability of the TSA line when I'm heading out of town. Sometimes the regular line is nothing but we've had 25-30 minute lines sometimes. With PreCheck, it's usually about 5 minutes max (and I love not digging out the computer/doing the shoes/taking off belts etc)
My 2 cents.
PS (on edit): when we got our Global Entry, the waiting time for an airport interview was about 6 weeks. Our daughter ended up getting hers at SFO where the office is open 24/7 (even though the site says 9am-6pm...go figure)
PPS : process no onerous. Questions were pretty benign. Felt like a normal interview getting on an international flight in europe. Included fingerprinting but I was already in the system so no big deal.
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