I'm guessing it depends on the size of your group.
There were 4 of us, and it certainly was easy.
We had two kids, luggage, stroller... We stayed at the Hyatt MCO, left our luggage inside the room.
Next time we saw our bags they were in our stateroom.
We didn't have to deal with carseats, etc.
We travel plenty, so goodness knows we have tons of experience with carseats and rental cars, etc. This time, though, it was nice not having to deal with it.
We also flew in from the West Coast, so it was 9:30 by the time we landed at MCO. We just wanted to find our hotel room, eat dinner and get the kids to bed.
(We did rent a car for the return as we did sightseeing post-cruise. It wasn't a huge hassle, but it was certainly a lot more work. I have mastered pushing a stroller while pulling a rollerboard suitcase.)
Honestly, this all depends on YOUR own personal ratio of money:time:hassle.
You have your choice of : easy/fast/cheap. Pick 1 or 2.