What helped me decide was first doing a custom touring plan in touringplans.com without any fastpasses. I think you can do this without a subscription. Put in all your attractions, the parade, Wishes, where you want to eat and when, hit optimize, and you get a good order and projected times and waits. If it gives you too many gaps shorten the day so it puts everything in order without gaps. With that, see what the lines are going to be in the morning and if a fast pass is even worth it. (e.g. why get a FP for the Jungle Cruise if you are doing it first thing and the wait is only 12 minutes. Instead do fastpasses for your first three rides that appear to be 25 minutes or more. I also after getting the fastpasses, put them into touring plans and do the plan again and then tweak my fastpass times to work better with the plan if I see gaps. (It might not be enjoyable for everyone, but I really enjoyed tweaking my touring plan and fastpasses to line up a great plan for my MK day.) Also, once you have your plan order the way you want, hit the evaluate rather than Optimize button to recalculate times, etc.// Also, I'd say if it's morning or afternoon grab a 7DMT FP if you can get it. The line for that one is always long and that's a FP that seems to be very popular and not available to many people. As an offsite visitor I could only do my planning 30 days in advance and I still did very well, but 7DMT was the one fastpass I couldn't get, so I will end up doing a 49 minute wait for that. My second longest wait is only 21 minutes (prediction), and so much is walk on.
