Great thread. I could loose a lot of weight, probably one entire person. I am a big guy.
Our muster was in AP, the chairs were murder. That was about the only problem I had. When we walked into the dining room, our server went and got a chair without arms without making a big deal at all. He had it ready in all 3 dining rooms at our table, very easy. I found out later you can request this in advance through
DCL, just like you request a specific server.
The chair inside the buffet have no arms, the ones out on deck do, a tad tight but if I could fit you can too.
The chairs in the theater were tight but not unbearable, I sat in the back a few times. I found the aisle seats at the front of the section were the best, so I got there early.
As far as in the pool, I just wore a shirt (I burn, so I would do that anyways), no one cared. I have been on 3 cruise lines...I will say Disney has the most normal sized people. Lots of fluffy dads and moms in sarongs, no big deal. Carnival was more of a meat market.
My issue in the shower was I was too tall, my head rubbed against the ceiling, and I am only 6 foot even.
Just go, have a great time. No one will give you second look.