Now this is a thread i can get behind,
since i have nothing good to say about the FFP debate in spec. lol
My personal favorites at each park:
Magic Kingdom - Most people would probably go for the Tangled restrooms across from Peter Pan due to the theming but i'm gonna hit ya with PIRATES - NO, not the ride! The bathrooms! If you're saying, WHAT PIRATES BATHROOMS? The easy-to-miss bathrooms in the GIFT SHOP after the ride! There is almost NO ONE in these ones EVER because they're all going RIGHT after exiting and the bathrooms are to the LEFT. This one has proven time and time again to be an optimal
Epcot - American Adventure and Norway used to have my butt firmly planted, but i gotta go with the often ignored back section of Japan. This one is a hidden gem because it's a literal adventure to get there! You have to go up like two/three flights of stairs, over a bridge, past a couple water ponds and features, around some outside dining space for Katsura Grill, and you'll see the tranquil entrance in the distance.
Hollywood Studios - RIP to Gonzo's right across from Muppetvision, not for being the cleanest but for just having a TON of stalls. Hopefully this is refurbed and reopened with the Monstropolis expansion. I have not tried the Animation Courtyard bathrooms since Star Wars Launch Bay days, but i'm excited to get back there in September as i will be there when that new walk-through opens! I've often found the Toy Story Land and Star Wars bathrooms pretty good overall. For the love of all that is holy, avoid anything on Sunset and Hollywood. lol Literally never had a good experience in either of them.
Animal Kingdom - This one feels pretty easy because i tend to just use the ones in the restaurants that i frequent: Satuli Canteen & Yak n Yeti. But... now that i think about it... Animal Kingdom might have the nicest bathrooms of all the Disney parks. They're usually well-maintained and out of the way enough that you can find a pretty private one no matter where you go. BIG shout out to the ones outside the Finding Nemo show - you'd think there would be tons of kids because of the kid-show, just go during the show and not after!
Universal Studios - Fallon not during HHN is great. Fallon during HHN is the opposite of great, for obvious reasons. I usually skip Simpsons but i do like their bathrooms. I've had some success at the Kidzone bathrooms outside E.T. Would recommend if going in that direction.
Islands of Adventure - RIP to Lost Continent, you might not have had much that interested me outside of Mythos but you did have a good bathroom. I usually use the one in Mythos while i'm there, but that was good for when i wasn't. I would've said Pizza Predatoria is my #2 but it might be my new #1, so i'll check it out the next time i have to do a #2.
Epic Universe - I love the theming on the bathrooms between Mario and DK, but i admit that they're usually busy. Dark Universe's Dark Toilies usually get my action because that land isn't often the busiest. I'd probably give a shoutout to the ones across from Ministry, as it's usually a good idea to use them before queuing. I haven't used Berks yet - admittedly spent the least amount of time here between the 4 worlds.
@TheCodeMan95 and @Parkscope I am now on a quest to try both of your suggestions!
I'm officially less than 60 days away from my next trip, all dining confirmed, so bathrooms will be explored!