I'm in the Nikon system, both F and Z, and I actually just packed my 85 f/1.8 to go next weekend to WDW. While the speed is nice, the real reason it made the bag is as a general purpose telephoto as compact as possible.
For most trips, a 24-120 f/4 or similar is how I end up with decent telephoto reach for Disney, but because I was packing my 24-70 f/2.8 as my mid-zoom this time, I needed something to fill in for telephoto, and between an f/4 or f/5.6 zoom, or a 105 prime, the 85 was the smallest and lightest and it gets the job done.