My wife likes to text me updates about the kids, messages from the kids, updates from home, and just "chat" during down times and when I get back to camp. It was worth it to have the unlimited plan for the 1 month and then just put the plan on hold after I was done with my out of state hunting for the month.
Two years ago I ran into an issue where my transmission crapped out on the exit ramp in Colorado for where we were going to start the trek up the mountain. A trip to the airport (from a friendly local who picked us up on the side of the road) for a rental and then setting up a drop-off to the transmission shop and then we were on our way up the mountain. The unlimited plan definitely payed for itself with all the messages between me and my wife where she was playing middle man with the transmission shop surrounding work to be done, cost, and timeline for having the work wrapped up and passing it all along to me. We actually stayed on the mountain an extra day because the shop had a delay and I was able to get that information by using the messenger an unlimited amount of times. In the overall costs of the hunt, the extra $40 was a drop in the bucket. Don't overthink it.