Hi, my family also did the 4 land/3 sea trip. It was great even though it rained on us most of the time! I did like having all of the hustle and bustle of the parks before we cruised so that we could relax on board. But I agree with Lisa that I would have loved the 4 days at sea. The reason we did it this way was because we didn't know how we would all do with motion sickness. I have a tendency to get very car sick and was afraid that if I was sick, that 4 days might seem very long. I was sick on the first night, but there was also a pretty big storm. The other days, I was fine. We've since booked just a 3-day to get another taste!
Another thing to take into consideration is if you have been to WDW before. We had gone in June 2001 for 5 days so we did only the things we really wanted to do again in June 2002. When we went the first time, we felt like we had missed out on somethings, like the waterparks and disney quest (great with all the rain). Since they were included in the 7 night package we got to see them all.
Lorie