We separated with our kids with DisneyQuest. I took DS and DH stayed back and took his little sisters to the pool and such while we were at Disneyquest. My girls are not really into video games, so my middle girl who is 9 still has not ventured into DisneyQuest.
If you don't have to pay extra for admission to DisneyQuest with your tickets, then you could try it out and if your youngest does not like it, you won't feel like you are wasting your money there. It is five stories of noisy games/computers/virtual realty things/ etc. It is also kind of dark in there, also. I would only do that if my child was a true lover of video games. Also, there will be a lot your youngest could not even do because of height restrictions.