Do you have two or more kids? I say it’s different. For people with more kids, a single child seems like a walk in the park. Because in the worst case at least one parent is "free". With two or more kids the default is being fully occupied or if one partner takes all of them for the other to have free time, it’s insanely draining and the other partner feels almost pressure to make the sacrifice worth it.

This of course being said about the situation without any parents around. The step from two to three is worse for car/transportation and hotel room but I think it’s not nearly as hard as from one to two.

What you also have to consider: You’re gonna have bad nights. With one kid only, it’s fine. You can recover. With two, you simple don’t have room for that. The bad nights will eat you up.