DW and I went for the first time alone this past MAY. Just a quick 4 day trip and we LOVED IT!
Let me say that we love it with the kids (last trip was 3 girls 10,16,21). It was nice to eat when and where we wanted. We were able to get up early and stay out late. BTW, we were able to justify the cost of seeing Cirque, which we loved. We told the kids that we were going, and since we are going as a family again in December there was very little grumbling. My advice...do it, the kids'll survive.