Only if the movies are in 4k resolution.
However, you referenced the word "power user." If you are doing anything graphics intensive, it will help a lot. It's just that watching 1080p movies can easily be done on any computer built in the last few years, including an rmbp.
Currently or say 3-4 years from now will you see a benefit of a discrete gpu as opposed to the irispro for surfing the internet(youtube) or watching movies ?
Currently or say 3-4 years from now will you see a benefit of a discrete gpu as opposed to the irispro for surfing the internet(youtube) or watching movies ?
If the average user plays games, or use anything related to 3D or graphics. Yes, yes it does. Unless you don't care about having really good 3D quality for any OpenGL.
Not for games in my instance - I was just wondering if surfing the web or watching movies will require the 750M for best performance say 3 years from now ???
No, for your uses you do not need the 750m, even in 4 years.
In four years the 750m will be pretty slow by present standards, so I don't think it will be of any use.