When my partner and I travel, we travel at a breakneck pace. We get up in the morning, stuff our faces with some calories, then head out, and we're usually walking, backpacking, bicycling, motorcycling, and occasionally train/driving/tour busing through most travel locations for 10+ hours a day. We frequently net 7-10 mi of walking per day unless we're in a particular place where you have to drive to get around. I still use my smartphone to download tickets, reservations, and maps (often don't get signal in parts), but we never sit still for long enough to have more than a small peek at the smartphone while having lunch or dinner.
I'm always amazed at how many people find it so difficult to disconnect on vacation. Maybe if you're the type to sit around in a comfy hotel and vacation that way the temptation is stronger, but for me, travel is the easiest way to disconnect.
I probably don't disconnect as much as I probably should for certain types of travel. But not everything about completely disconnecting is wonderful.