So, a week in the Lake District, on a cliff over looking the sea in Cornwall, or a remote cottage in the Welsh mountains isn't a holiday, but a week in a Spanish shithole is the real thing?
Just because a particular type of holiday isn't to your taste, it doesn't mean it doesn't meet the definition of "holiday".
Travelling around the UK or Europe in a campervan would be pretty unappealing to me, but I would still call both a holiday. Presumably, you would only call it a holiday if it was in Europe.
We all have certain triggers that announce to us we have arrived on holiday. For you, it's the plane landing. For others it might be the first glimpse of the sea, the Snowdonia mountains or Blackpool Tower.
It doesn't matter, they all create the excitement for the week/fortnight to come.
We are fortunate enough to be able to afford two or three holidays a year as well as many short breaks. We go on holiday to many different places in England, Scotland and Wales (and a few times to Ireland).
For example, we spent four weeks travelling round the Outer Hebrides and last year we went on a 10 day cruise of the Scottish Isles.
However, by your definition we haven't been on holiday for 15 years...