I'm using G+ so far more or less as my YouTube account.
Trying to keep it minimal, not "subscribing" to too many people. One guy uploaded about 60 videos in two days, so yesterday I tried to mute his posts - his posts from today are shown twice  in notifications [/edit] (but in fairness, I haven't seen much bugginess apart from that).
A strange thing about G+ is that you can follow anyone - I'm not clear what exactly this means - can they still post stuff yet hide it from certain, or all followers?
That aspect doesnt actually bother me, but there's a streak of being a stalker in 'following' - I follow you: you have no idea who I am, or why I might be following you. You check out my site, maybe I dont make public posts (I do, as it happens).
I nearly prefer the FB approach where you make a request. But either way, my ideal would be that you would have to type a few words when choosing to follow someone. That person might not even read it - but if they choose to, and are interested in what you say, they could then follow up on you (apologies for the sort-of pun), and maybe even follow you.
I can see it being more suited to more wordy posts. Meaning I dont see it as being particularly suited to YT. Mind you I prefer to look at my G+ page than my oversubscribed YT page
But I aint particularly happy with either.