I had the same guilt issues when we went 10 years ago and we were on our honeymoon! (took the little guy because we wanted it to be a celebration of our new family)
My son was six and we took him to the Neverland Club at the Poly. It was soooo cute that *I* wanted to stay there! (of course this was 10 years ago, so it could be different now)
The entrance was decorated like Wendy's bedroom and the check-in CM sprinkled "pixie-dust" on him with a wand and he had to climb through "Wendy's window" into the club. The area he climbed into was a rest area that looked like the sky with big cloud pillow/beds and twinkly starlight.
There was a Skull Island arcade (free) a kid-sized buffet that was shaped like the crocodile from Peter Pan, a little movie theater that played disney movies and more. (I asked to walk around and check it out before we left him.)
They gave us a pager and we went to dinner at The Brown Derby (which was wonderful and very quiet and romantic
) and then a stroll on the beach at our resort.
We picked him up at around midnight I think and he didn't want to leave! He asked to go back there *everyday* for the rest of our trip!
He is 17 years old now and he *still* talks about that night as his favorite part of the whole week. *LOL* "It was so cool mom, *free* video games and movies and all you can eat food all night!" *LOL* (of course it wasn't free to us-at the time I think it was five or ten bucks an hour?)
So I would say, go for it and have fun and don't feel bad, because if it's the same as it was then, your kiddos will have a blast!