Long time no see! Haven't posted here in a while, as I was really busy at work and kind of got out of the habit of stopping by over lunch. I hope everyone's well!
We rode on this during the passholder preview, when we were lucky to be at WDW (my husband had a conference!). I was using an
ECV and transferred. The queue is entirely accessible and is nice and roomy, although it is kind of dark if that is challenging for anyone. It is very nicely themed with lots of detail, and it feels like you are underwater. Although it is not brightly lit, there is enough lighting and stuff to look at that it is not at all intimidating for those who get spooked by dark rides.
I exited the queue as I was about to board and parked my EVC nearby under a stair, and then walked back. It is a short walk, about 14 feet or so total. The clamshells face out, a la the Horizons vehicles. The opening for the regular shells, which I used, is in the center and is narrow to get through if you are not pretty nimble. The walkway is rather short; the first time, I recommend having them slow it to see how you do (it is far easier to get out, as you can use the entire walkway to ease yourself out of the clamshell, as opposed to getting in when you have to make your way to your shell and get in).
What's especially nice about the attraction is that unlike any other attractions that come to mind, the sound for each scene is longer than the time it takes to traverse that scene. So it's different when you see it again, and if they slow or stop the walkway, it does not repeat right away. Nice.
Overall, the ride is extremely cute! It captures the feel good parts of Nemo, and is not scary (the movie IMO has some quite scary sequences). It is largely scenery with movie screens integrated in. To try and describe it in case it helps anyone, there is a scene with the shark but it doesn't come at you or anything-- it is a "fish are friends" type of scene. There's a cool part where you are in a tube with images projected on top and in front of you so it feels like you're in the current. Might be a bit challenging if you don't do well in a setting where you feel like you are moving. The last third is the aquarium with the Nemo characters seemingly in there! There's a very, very brief dark scene with white lights like stars. The end song is catchy and upbeat. Overall, the one word description is CUTE!
The walk at the end back to the EVC is about the same length as at the beginning. Like I said before, I thought it was far easier to get out than in, bc the whole walkway can be used to exit. I felt that I needed the walkway slowed at the beginning but not the end.
We rode several times over the course of the preview and really enjoyed it. Also saw Turtle Talk with Crush for the first time!
The other info of interest that I learned is that there are quite a few additional places to see Illuminations other than those on the map. I asked a castmember and she directed me to one that I had never tried, and it was great. I have not been a big fan of Illuminations before, but my husband and I really enjoyed it, and the excellent vantage point and lack of people blocking me really helped.
Used my GAC with no problems at Food & Wine events, although I still ended up with a touch of sun poisoning despite everyone's best efforts.

They now have a more formal way of handling my situation which worked out well and is, I think, an improvement because they are more consistent so it is easier to know what to do and what to expect.
For MK, a castmember directed me to a good spot for the new Castle forecourt show-- facing the castle, a few feet up on the path leading to the castle right up against the guiderail. I needed to "excuse me" a few times to people moving in front of me in the center area who totally blocked me, but this was a huge improvement over Cinderellabration, where I got totally and hopelessly blocked when everyone stood up.
That's about it! I hope that the accessible shell works out well for everyone who needs it. Just wanted to pop by and say how much we liked the new Nemo ride!!!

Cupcake