Just returned home last night after a four-night cruise with my entire family for my parents' 50th wedding anniversary.
We booked our cruise through an online agency that I have used many times and got a good group rate of $419 per person for the 12 of us and a little more for my parents' outside cabin.
We flew into Orlando the night before and rented a car from Avis. In the morning we drove it to the port, dropped off the luggage and our kids and took the car back. They have a shuttle running every 20 minutes or so. The cost was only $38 for the four of us and we didn't even have to put gas in it because the ride was so short. From the airport it is a straight shot to Canaveral with a $1.25 toll. SO, if you are leery about getting lost and not wanting to rent a car, hopefully that will alleviate some fear.