First, it depends totally on the airports you use. My local airport has 2 gates and only one security line, so precheck/GOES is worthless to me outbound. Then, it depends how often you fly. Returning from international travel, I tend to fly through PHL and the wait for baggage is always so long that skipping the 10 minute wait for immigration is irrelevant.

The list of airports with GOES is at http://www.cbp.gov/travel/trusted-tr...ntry/locations. Note that neither Montego Bay nor Kingston are on the list. And I don't know where you went in Europe, but it doesn't appear to help much if any there.

Unless you fly really often, I can't see the effort and expense being worth it. For once or twice a year, no way.