Not gonna lie, almost everyone is going to drink alcohol - some more than others. By the end of my first year I was pretty much over it - very bored of going to clubs and things. Not sure if I'll bother next year or not.
You will save tonnes of money, in my case, the people I know seem to dislike pre-drinking so often end up spending upwards of £40/50 each a night on alcohol. Which is absolutely crazy to me.
Don't really get why people on TSR seem to think you therefore won't have a social life. At my uni at least people go out and do loads of stuff in the day time and do loads of things that don't require alcohol. So...