I actually almost exclusively rented movies from YouTube until my friend repeatedly pushed me into getting something called the "Nvidia Pro Shield", which has all movies and [believe it or not] in even BETTER HD quality than YouTube when you PAY to watch them. Explain that one.
It's like £3 weekly to get this [illegal, no doubt] streaming service. Yes - you pay in Pounds Sterling, lol.
When I'm on my laptop, I use this website:
http://www.fmovies.wtf^ Now...FYI, it's a bit buggy. There will be popup ads, although they seem to diminish in number the more you use it.
I also can't guarantee it is completely "safe" [virus free], but it does have a big selection of movies to stream from.
I have historically almost always paid-to-watch, but some movies, I can't even get UNLESS I [illegally] stream them.

Hence, only this year at the behest of my friend, have I primarily streamed what I watch.