Yes, but as a side note, there is no need to full "Allow" Google; "Allow for session" is enough. For YouTube, for Gmail, for Blogger, for whatever service they have.
And we can go beyond and just allow accounts.google.com subdomain for session, that is the cookie that holds the actual login check than then is passed to YouTube to set another login cookie (aside the one for Google+ comments).
BTW I rejected to sign in for Google+ for comments, so, I stopped using YouTube logged in. Has no sense after that move. I left session cookies just for my old account, so see video stats.