I think the Heavensward unspoiled nodes are designed for people to gather while doing other gathering in the same zone, not a time-table travel around the different zones. I've had absolutely no trouble fishing in Coerthas Western Highlands, popping into BTN/MIN when I see the unspoiled node notification, fly to the nodes and gather. The interval between the BTN and MIN nodes also means that my 600 GP is fully recovered even if I just sit there doing nothing.

And it doesn't disappear in 1 hour ET, it disappears in 55 minutes ET.

Don't forget that the crafters use a lot of these products from the unspoiled nodes as if they're from the normal nodes. It makes a lot of sense to be gathering only the nodes from one zone instead of teleporting around on the clock.

Once you realize this, and know that the nodes spawn once every 35 minutes, it's actually quite a nice system.