We LOVED the cruise, we did do a Land and Sea package which gave use some nights at the Poly, but the cruise was the highlite of the vacation.
No they do not feel crowded, except the adult pool was always pretty full, not that I was complaining…
We thought we would have DD2 at our side the whole time, once she found the teen club that was it, we saw her for dinner and at bed time. Her one comment was she wished we had started doing Disney Cruises sooner cause she really wanted to play at the Explores Club (pre teen)
All the food you could want, besides the scheduled meals there was always stuff the munch on around the deck and it was all included.
Finally my one recommendation, be sure your room has a balcony, there is not much in life better then sitting under the stars, sipping a nice single malt, and watching the waves go by, man I wish we were going! !
( this also reminds me that all our cruise pictures are gone along with the pictures from the birthday cake castle, sigh! )