I would not bring a nanny in holidays for mainly privacy reasons but i always have a babysitter at hands so we can have some time out. But god knows i wish i had a full time help for all the chores at home and on holidays
I totally get why some people wants to take a holiday nanny with them. Good for them if they can afford/want to pay for an extra seat/mouth.
We prefer to be on our own but sometimes i wish i had mary pops with me