Yeah, I never got notifications like that.
I do, however, remember when YouTube offered public statistics on videos, and you could see how many times your videos had been favorited - I remember how I used to think how I wish YouTube would show you who favorites your videos, much like how DeviantArt notifies you on who favorites your deviations - I feel like that would offer better insight into who out there, exactly, evidently likes your videos enough, and maybe help inspire ways to better cater to your community.