In the UK or around the world? It seems very rare for a British park to still have a really entertaining dark ride let alone open a new one. Both coasters and dark rides have made some brilliant innovations since the boom in the 90s but we see barely any of this in the UK. This country's parks are playing catch up
You'll always get an amount of "it's rubbish now" / "that was the real Alton Towers" said about any time, be it the 1800s or 2020s. But in many ways, yes there was a silver age in the 90s and I think everyone really loves what came out of that. A lot of the stuff from that era is still the British parks' bread and butter appeal.
If you look beyond the big marketed parks, there are still gems popping up often! And Wicker man was the first solidly good big themed coaster a UK park has opened for a long time, Icon a fun ride too.
Some parks that were once rapidly growing face challenges today that maybe they didn't have back then. It's a mixed bag, but the public clearly still enjoy parks. I think parks should focus on maintaining their solid appeal than jumping on fads and gimmicks to try stay relevant.