you can still do it I think via the spotlight annotation, Smosh used to do this on a lot of their videos. I remember because I checked them out like a good 6months back I think, it was 1 of their recent videos or 1 of their popular videos. Never touched their channel again & probably never will.
I do this (at least I think I do) not because I think I'm a superstar but because I have this odd obsession with making things more complicated than they need to be. It annoys the hell out of me. Everytime I have something in my head I can never put it on paper properly :S then 1 idea flows to another and I'm stuck working an entire week on an intro & outro when I could have just created a still picture with music in the bacgkround... -.- I'm contemplating changing my intro & outro to something more simple, but I'm stuck there.
It's actually much easier to connect with fans via Twitter and Facebook as both of them can be used on the move more than YouTube. The YouTube app is still far from being great, it doesn't even have the feed counter to tell me how many new videos there are, let alone proper notifications. It's not always about time, it's about convenience, you can hop on Twitter on your phone wherever and whenever, if you're on your way to work, in the middle of working on projects or at dinner or something. But obviously it's not okay to disregard YouTube completely.
I always try to avoid calling my viewers fans since I feel that calling them fans puts them on a lower level, I don't want people to think I'm higher up than them. Mainly incase my idenity gets revealed I don't want them to get the wrong impression that I want people to come up to me on the streets and that I'll be all nice about it lol but I also want them to remember that I'm just a gamer/critic/rager and that it's like having imaginary friends sitting beside you & watching you play. The only time I think it's okay is when you do have a major following and it's pretty obvious when some people are just fans and some are actually watching you for you, if that makes sense? Like for e.g. Markiplier or Wade, I don't watch EVERY video they make, just the 1s I like, I'm not going to pretend to like a game or something just cause a bigger YouTuber is playing it.
I know which guy you're talking about, to be fair, he's at least trying to give to the community, yes he's advertising for himself too but it's also a service he's providing to others for free for content creators to use to boost THEIR success too. I will admit though, he's going a bit overboard with the amount of times he has been posting the message.