I sailed Jan 16 - 23rd. I just got back yesterday so the Oasis is fresh in my mind.
My wife and I are in our mid-thirties, and we have 2 kids: a 34 month old daughter, and an 8 month old son.
This is our forth cruise overall, first on RCL, and the previous three were all with Disney Cruise Line. We have always cruised with our kids and have previously only gone on Disney because it was the only cruise line with a nursery, which gives my wife and I some time as a couple without the kids, but can still enjoy brining our kids along. When we found out Oasis had a nursery, we signed up in October 2008.