I can't say I've noticed a difference. That being said 80+% of videos I watch are either from channels I subscribe to or something I've searched for. Also after I started getting more aggressive with using the Not Interested and Don't Recommend Channel buttons to flag videos on my recommendation page I feel it's actually gotten quite a bit better.
> I started getting more aggressive with using the Not Interested and Don't Recommend Channel buttons
Yeah, I've even had to start DRC'ing channels I'm subscribed to because YT seems to think that I want my homepage to be nothing but videos I've already watched from those channels.