So what’s your experience? Do you use Gmt or not?
I can add and subtract, so I've never understood why people would need a GMT watch.
I suppose if your notion of “traveling” is both “once in a while” and “one or two time zones over” then it’s less critical.
But if you travel frequently to multiple locations, including to places with far desperate time zones (including date changes) it can become disorienting - or it can become nettlesome to be doing constant math (even if easy).
And it just gets worst if you both travel frequently AND communicate via phone with multiple locations.
I live in Texas, my ‘local’ GMT is permanently set to Sydney AUS - which seems backwards, but allows my ‘true’ GMT to constantly tell me not only the exact time of one of my major client’s HQs, but also gives me the base number from which to “do math” for other parts of Asia (HK, Tokyo, Malaysia).
And my ‘travel’ time is then set to my local, be in TX (when home) or wherever I’m traveling to - again, not only to tell me my local time, but also as a base number from which to do further math for other nearby zones of need.
All of this, I suppose, is not too dissimilar from why pilots and crew often wear GMTs as well? Again, it’s one thing to “do math” for an occasional trip a few time zones away; it’s quite another to “do math” several times a day, for multiple time zones, on little sleep and jet lag.