There's a wild difference between referencing some giant fanbase you don't have ("WHAT'S UP MY LOYAL ARMY" -> 5 subs) and putting in a little greeting for whoever is watching. It's like whining about how people always say "hello" on the phone, come on. Not EVERY video needs a greeting, but if it's a video that's intended to be a connection between the creator and the viewer (vlogs, tutorials, whatever) then... say hello. Otherwise it's just jarring.
Sometimes I get the distinct impression a lot of people don't do much socializing. Every complaint in this thread would be considered basic interpersonal skills, or whining about people doing things that have any personality to them. There's a reason the top YouTubers are the top YouTubers: people who watch them get the feeling that, on some level, they're "friends" with the YouTuber. They're not watching some detached celebrity up in an ivory tower, they're part of a social circle that's led by someone with charisma. It's not just dry discussion.
Protip: if you say everything the same way as everyone else, you have nothing differentiating yourself from them. I point at JackSepticEye. His introduction is distinctive, it's energetic. And before you say "yeah well he has a big fanbase..." he didn't ALWAYS. But that introduction style was part of the big picture that helped gain him one. That kind of personality draws people in. The less connection you offer your viewers, the less interest they'll have.