Also a big fan of Disney Sea
Just be aware that, if you are used to Disney World and Disneyland, fast passes are a very different experience at Disney Sea
Most popular rides will be gone in minutes
I would strongly recommend doing some looking into how to do them efficiently
I would offer suggestions but I was last there pre-COVID and I'm sure things have changed
The reason I would say budget a full day for each park is that you will be spending time in queues
Generally no problem for us as English speakers in the park though