Disable TouchWiz

Hi,

I'm thinking to buy a S6 but I really don't like the touchwiz (I'm not the only one :D).
I read that using the google now launcher and the Material Theme is possible to have a sort of google stock image on the s6. Is it true? does it really disable the touchwiz functions?
Is there any other way to have a google stock ( Nexus like)on the s6?

Thanks a lot to everybody