Hi. I just joined the Y back in February. It has been SO worth it. My children are 3 and 1. They have their issues from time to time with the daycare (I am a SAHM, so they aren't used to it). But trust me, the workers are used to it. They just want you to go and use the benefits of the gym.
They have a limit, 2 hours per day for the daycare, but that is more than enough time to get done a work out. Just be warned that most classes charge extra. There are very few that are included in your membership. I took a pilates class 1 day a week for 8 weeks and it was a $30 charge. Not too bad, but the family membership is around $75 per month.
All in all I am happy with the Y (we go to the one in Mt. Clemens) and considering before this I had my daughter at Gymboree for $55 a month, the extra $20 for all you can use equipment and the babysitting is so worth it. The FitLinxx or whatever it is called is really helpful at tracking your progress in the actual gym. It even sends you reports in your email about what you have done that month.
At least take a tour. They are really nice and the tour takes a half hour or so. We were on the 'yes' side of things within 10 minutes of the tour and are not sorry with our decision....