My go-to for spinning up a site has been Jekyll + Bootstrap with the occasional bit of React for well over 10 years now.

While it still does the job, I'm a little curious to explore more modern options, if for nothing else to understand the choices a more junior dev would face/make today.

I'm seriously considering giving Atro a go. Is it worth it?

Yes

Guess I should have stated the questions as "what makes Astro worth while to try out?" :)