I might be the only person who wasn't saddened by You're Welcome. I was sad to see Cordy go, but over all? She lived a happy life.
I never felt that close to Doyle, either, so I was just "meh." towards his death the first couple of times I watched it. The third time, though, I cried. It was so beautiful that someone in this world still has honour (yes, I know he's fictional and that I'm a loser 😛).
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The saddest moment in the series for me was when Wesley died. I felt that Wesley, out of all of them, got the shortest end of the stick (haven't seen S3 & S4, so couldn't say one way or another on Connor). I just bawled over Wesley. He grew up being abused by his dad, trying to make his dad proud. Became a member of the Watcher's Council, only to be fired (and felt like he failed for being fired). He joined up with Angel, and he finally had friends. But he was manipulated into betraying Angel, and I don't think Angel ever completely forgave Wes for that. And I'm pretty sure Wes knew that Angel didn't forgive him. And Wes never even had Friend. Well, he had her for all of what? 5 hours? Yeah, that's real great.
So yeah, that's why I felt that Wes' death was the saddest
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Back on topic, I remember when Cordelia mentioned that Doyle was like a brother to Angel. I was all "...Huh? :s" Because I honestly can't remember Angel saying more than 5 words to Doyle throughout Doyle's involvement in the series. I will remember you! I remember that. Doyle was the one Angel confided in, then. But other than that, I just don't see Angel thinking of Doyle as a brother. I can see Angel thinking of Doyle as a friend, someone to go to a sports bar with (if Angel still did that sort of thing), but I can't see Angel thinking of Doyle as a brother.
Maybe Angel saw Doyle as a younger version of himself, though? I dunno. I just keep thinking of when Doyle's all 'Blah blah Cordy blah blah." and Angel's all "You think she's a hottie." And Doyle's all "Well, she's a stiffiner, all right. You can't deny that."
I just...I never felt close to Doyle. I think his death was too soon into the series for me to become emotionally invested in him.