I did the Verizon Travel Pass last Sept/Oct in France. I was doing a combo of independent travel and tour travel and knew I would not need the phone on my tour time. In Paris I was with a friend who was having some mobility issues so I thought we might need to have the availability to use the G7 app to arrange a taxi pick up when we were out and about. We did and we did, lol.
I wound up just paying for 5 days of international coverage out of 30 so the Travel Pass worked for me. In my "normal" life I don't talk to anyone on the phone, lol. It's usually a spam call. I could keep up with contacting family using hotel WIFI so that worked fine for me.
BTW, I tried to go into a Verizon store to set this up (I live with my brother and SIL and they were not traveling with me) and was told it could only be done online or on the phone. The person I talked to on the phone was actually very helpful as she was familiar with the plan and advised me to just keep my phone in Airplane Mode until I needed to use the calling plan, then switch. That worked perfectly as you can access WIFI in airplane mode.
BTW, my friend and I downloaded What'sApp which works on WIFI so we could text back and forth on meet up times, etc.