We didn't go on vacation when I was growing up, as we couldn't afford to do so. But if we had, my mother would have done all the choosing and planning. Just as I do all of the planning. One week a year is with my husband's family, so I guess I don't choose that one - although I am the one who gets with them to make a decision on destination, not him. I am also the "tour guide" as my husband likes to say. I do all of the planning, even if he has determined the destination, such as a trip to Costa Rica a couple of years ago for a competition.
But going to WDW was never a major vacation due to proximity. I've gone with my children and without my husband more times than with him. So I don't know if I would have made a unilateral family decision to go there.
We have no problem taking short solo trips to pursue our different interests; I travel a lot for my sports officiating, and he travels for his shooting competitions. I just recently spent a week helping my son get settled in a different state. I am now a 100% empty nester.