Having just returned from a fabulous Christmas holiday flying in Colorado and Florida, I concur that any expression starting with a "Q" is unlikely to be met with a full and complete understanding in the continental US. The words that get the correct answer are "altimeter setting".
The highest field I flew into was Buena Vista at elv. 7,950', (sadly I missed Leadville 43 miles further up the valley where the pattern is flown at 10,700') and the lowest was Everglades at about 6'.
Reading the Denver sectional and using QFE are two things not to be done together and I made copious kneeboard notes before I set off of the airfield elevs and pattern altitudes I was going to encounter. The changes in altimeter setting over relatively short distances surprised me.
The same principle of using QNH easily translates into my normal flying in SE England with Redhill at 222 ft.