I think it depends on how much enjoyment you'll get out of having a larger number of photos. If you're going to want to print multiple photos, use them as phone backgrounds, etc., that starts adding up to where it might make more sense to buy them all in bulk. For the week-long trip I did with my mom in 2015, though, we did not buy it and didn't have regrets. We stopped for a few Photopass photos (mainly on the Halloween party night, when we were dressed up), made sure any fun ride photos got linked to our account, and at the end of it had a decent number of photos to choose from, but definitely not hundreds of them. We got several printed (I've got two ride photos in a photo frame at work, and a nice one on Mainstreet USA in our costumes to hang on the wall), and since that was all we really wanted it was much cheaper to buy them individually. I think I would be overwhelmed if I suddenly had 200 photos to download and do something with, and not in a good way.