DH and I took our kids twice and then went by ourselves when DS was a freshman in college. (DD was in high school and stayed home.) We had such a good time going by ourselves that we did it 9 more times in the next 13 years. One of those trips our kids did come with us - we were celebrating DD's college graduation. Actually, that trip with our adult children made it clear to us that we enjoyed WDW more when it was just the 2 of us.
Sadly, 2 weeks after DH and I returned from our last trip to WDW, he was diagnosed with lung cancer and died 13 weeks later, in Jan. In Dec. I will return to my favorite vacation spot without him and that will be very hard but there is no place where I would rather go. The next trip will be an entirely new experience as I will spend 2 days alone and then be joined by DD, DSiL and my (then) 6 month old grandson.