Hi cant give you an experience at WDW since I have had to cancel the trip 2 years in a row.. but I can tell you what happened at Kings Dominion ...
Soen background ... I seldom post here been a member for awhile and some may remeber my problems I have Fibro, Lupus, Rheumatoid Arthritis, Kidney Disease and a few other diseases too.. Had neck fusion surgery this past May (still recovering) and now some type of mass on my liver casuing me to lose 65 pounds (needed to lose though) the mass is benign thankfully just bothersome
I rented a
ECV at Kings Dominion it was a godsend in some ways in others it really didnt help because we discovered Kings Dominion is NOT very handicapped accessible

, I took out a display of stuffed animals because the aisle was too small... This was in October kind of cool not hot... I was exhausted by 3 pm got there at 10:30 am and ready for a nap at 3:15 and I had to have my husband carry me out of the park ( i weighed about 280 at 5ft 11in) to my van to sleep until the others we were with were ready to go home...it put me into a BAD flare we think it was a combo of Fibro and Lupus not sure... i was in bed for 2 weeks and in and out of the ER 5 times.... At that time I had just started on the Duragesic Pain pacth at 25 MCGs which did me not much good.... I dont know about WDW but I had to carry additional meds with me and they gave me a hard time as they searched us as we went in, what are these for things that were none of their business so I handed them a letter from my loveable rheumatolgist explaining my needs god bless that Dr I love him ..
I am on some pretty heavy drugs now as I flare just sitting at the PC (woudl could explian why I am hardly posting anywhere anymore) , cooking dinner things like that.. I am on a Pain Pathc duragesic 50 MCGs now and I take both Vicodin ES 2 tabs with a Talwin for breakthrough pain...trust me it doenst always work.. I am on a first name basis with the Local ER staff, they see me coming they jump they know I'm in pain... I guess some people we flare easily others can go months with no flare up..me I am just thankful if I get one day every so often where I dont....
Just because I had a bad experience elsewhere doesnt mean you will at WDW, but I say this much keep meds on hand ,use that EVC at all times, if you need a nap take one , avoid the sun I think it interacts with some meds, you should see me the first time I overheated with the Patch on I was in bad shape lets just say I had to go to the ER.... Mainly try to have fun and I hope you have a very supportive family and friends with you, I think thats what saved me a lot of my frustrations in Kings Dominion when I had the accident with the stuffed animals they made it comical and alll....
right now I cannot forsee any trip to WDW or any amusement park got some reasons Money (lost $300 in DD when someone threw my rewards program goodies envelope away). My 4 yr old was just diagnosed with ADHD (dr refuses meds) and he is hard to handle and the fact my once supportive husband decided he loves me but can no longer live with me and my medical problems or sons issues and walked out on 19 yrs of marriage....sorry didnt mean to vent or get personal I'm handling it well.
Just have fun and rest, make sure you dont miss any medications, I take 30 meds a day and I know when I've forgotten to take something my body tells me...and THAT is the most important piece of advice I can give DO AS YOUR BODY TELLS YOU AND IF IT SAYS WHOA ~ SLOW DOWN once again HAVE FUN
Sorry so long a post just my insomniac steroid induced ramblings tonight

Sorry so long