My visit at the end of February, I did notice a large difference in battery use, but I attributed it partially to a newer phone. Went from a samsung galaxy s7 to a S9+.
S7 would require a fuel rod or two to make it through a day. S9 did not use more than 50% with similar days a year later. I figured some was the phone, but also figured connections were better, along with the app being better. I think I also added in the disney play app as well on the latest trip.
Wife had the same phone for both trips, and she noticed and improvement in battery life. Anecdotally, I think it means either the data availability is better, or the apps are becoming less hog-ish.