Yes, it beyond awful, everything need multiple passages to do things there were instant on PS4.
But the WORSE thing is the lack of PS button double tap for going from the game to the latest OS screen... jeez if that thing was crucial on PS4.
Now you can't do any adjustment without navigate the whole OS from zero every.fucking.time... it's just a chore.
Even see the trophies on PS5 is a total pain while on PS4 you would double tap back and forth from game to trophy list (let's not talk about the new trophy view, dear God...), or even going from the game to audio options or game from latest screen/video captured.
The removal of double tap is a tragedy, and they probably did that since the majority of PS4 users didn't know about that feature, and of course you don't educate users to use a good function but you just eliminate it for everyone else. We've seen this crap with Chrome, Windows and so on... they really make OS and interfaces for clueless ppl that doesn't even comprehend the concept of "shortcut" at this point.
And isn't only this, even the quick menu is much worse, video player is terrible (it only goes from 10 seconds at time and it's buggy af, you can listen the menu music in background and video start to stutter when you skip some seconds so you have to pause and play again to make it smooth again...), and so on and on.
The only good thing is how the new Share functions are managed and the possibility to always record the last hour and decide how much portion of that video save in any moment.
Other than that I would be willing to pay to have the PS4 OS... and I used the PS5 for Astrobot and some coop play with my brother, the hour count is really low and I already hate it.