You have no doubt heard people say how much they “need” a holiday, when what they really mean is that they want one. (1) Certainly, people working under pressure feel a very strong desire to escape from work and become less tight during their holidays and experience a changed environment.
However, work for many people today is office work and mental, rather than physical tasks.
(2) These people may seek much more energy-taking activities while on holiday, rather than simply lying on a beach.