I did a Wishes Cruise on my Girls only trip this year. My friend really wanted to do it and we just walked down the the Wilderness Lodge Marina and booked it for that very same night!!! And this was during Easter!!!
We really enjoyed it but I dont think I would do it again unless we had a large party because the only boats that have the music piped in are the larger boats and they give them to the larger parties......we did stop pretty close to it so we could hear the music a bit but it definitely took away from the experience.
I have also done the Illuminations cruise and would not hesitate to do that one again ...I am happy with the one time I did Wishes but do not feel the need to do it again.