I really like that podcasts have given lie to the theory that people won't consume long form content and that everything needs to be surface and tightly packaged for modern audiences.
I love podcasts where people with a passion and/or expertise make programmes about it - informative, fascinating stuff, often with interesting guests. I think Goalhanger do this particularly well - Tom Holland and Dominic Sandbrook are obviously the originals who cracked the format (and I've learned loads about parts of history that I'd never have looked into without them doing episodes about it) but I have found The Rest Is Entertainment to be unexpectedly eye opening and I've learned so much about stuff I'd never thought of, and The Rest is Classified is similarly interesting.
I've got a huge interest in 20th century history so We Have Ways is a strong favourite, along with War Movie Theatre which isn't quite as slick. I listen to Buffy and Walking Dead rewatch podcasts by really funny, interesting and gifted presenters for pure entertainment and nostalgia value.
There are also some great limited series - it was The Ratline and Tunnel 29 that first got me into podcasts.
I've taken a bit of a break from news and politics podcasts but agree The News Agents are absolutely top tier and are no less quality journalism than you'll get on any TV or radio programme - and long form gives them space to go deeper.
OP, you seem cross that "celebs are jumping on the bandwagon" - realistically, this is a new revenue stream and a lot more lucrative for the successful podcasts than TV appearances etc.
I love the podcasts I love - I have little to no interest in "celeb culture" so those sorts of podcasts would definitely irritate me as the live tv equivalents.
My experience of the TV and radio equivalents of the podcasts I like to listen to is that they're much shallower, less expert and less interesting. Live radio is fine to give you a really surface look at a wide variety of issues (many of which may bore you to tears); good podcasts go much deeper and allow you to really feed your own interests.