I can only tell you what my personal experience is. I laid it out more in another comment under rjurney's reply.

I'll also add that I am more frequently searching for 15 minutes then switching to another service. I used to find a movie to watch in 5 minutes. I am a big movie person too, and will watch most things. But I am also more aware that if I watch one show that is just "meh", then I am going to be bombarded with shows of similar quality for the next few weeks.

Also, there is a fairly obvious pattern that shows up from the movies in "my list". Those do not seem to be weighted more heavily.

It is surprising how bad the recommendations can be sometimes though – I avoid watching comedy specials on Netflix because if I watch one, then suddenly I must want to watch every single comedian ever. It's reminiscent of buying something on amazon, then seeing tons of retargeting ads for the same thing. Oh well, like I said, in general, diversifying my streaming sources has helped a lot.