"At the age of thirty--fiveish, she realised she'd never fly to Paris on an EasyJet with a stag do across the aisle...."
And Lucy Jordan sat up in bed, sweating, and thought, " Thank Christ for that!".
Hardly anyone's ever a tourist or just goes on their holidays anymore. Mostly they "travel" and learn about local culture.
A few honest people have mentioned the niceness of hotels (some hotels, and there are nice ones in the UK) and liking nice weather. Which is fine if you want the sun. I can take it or leave it.
I have "travelled". Much more often, I've gone on holiday, usually abroad. It's never occurred to me to be surprised if others choose not to and wish to stay in the UK.
I'm not sure if the lady mentioned in the OP hadn't been abroad because:
A) she wanted to, but couldn't due to lack of money/commitments at home (eg caring)/something else. Which is sad and shouldn't be greeted with slack-jawed "shock"
or
B) wasn't bothered, but when greeted by cries of, "What?! Never?!! OMG!" by others, felt embarrassed and made a jokey comment like, "You'll have to take me then".