Why I no longer understand Grey's Anatomy so well

Ah, here I think I'm not going to make many friends again today, but I need to get it off my chest. I was checking my daily round of online gossip last week and came across an article about Grey's Anatomy. Something about two of the characters who were going to leave. Never heard of either of them, by the way, and I always thought I knew quite a bit about the show. But honestly, after season 5 or so, I lost interest. And when I also heard about the misery that happened in season 12, I really don't understand why the series still exists. Because (spoiler alert): a Grey's Anatomy without a McDreamy? Yeah, no way, that just can't be.
I was obsessed with the first three seasons, with the relationship between Izzie and Denny. I cried when he died. And by the way, also at the end of the very first season, when you find out that Derek is actually married to the devil, Addison, whom you developed a soft spot for after a few seasons, but I was never attached to her spin-off series. Oh, and then there's the scene where Cristina gets dumped at the altar by Burke (which wasn't actually planned, but actor Isaiah Washington didn't behave very nicely towards co-actor T.R. Knight, which got him kicked off the show). Ooh, and the scene where Meredith holds a bomb inside a patient's body. The storylines were incredibly exciting.
But the golden team with which the show started barely exists anymore. Yes, Meredith Grey is still there (it would be weird without her) but more than half is either dead or suddenly moved away, which is why I also lost interest. McDreamy and McSteamy both gone, Cristina is gone, George O'Malley deceased, Izzie is gone, Callie is no longer in it, Meredith's sister, Lexie, died in a bizarre plane crash, and Teddy, where is she now..?
Anyway, die-hard Grey's Anatomy fans, help me out. Am I just being a whiner and is this series really still worth following? I'm also in a sort of black hole now without Stranger Things and Game of Thrones. Is it really worth it to follow all fourteen seasons now? A Grey's without my beloved Derek Shepherd, is it worth it?
For now, I'll just rewatch my favorite music moments from the series, because where they, like The OC (I recently rewatched all of them) were really brilliant, was in finding the most fitting music.
The bomb scene with music by Anna Nalick