The only thing keeping me from cancelling my apartment's internet is that the public library's wifi isn't fast enough to download anime episodes. Otherwise I would just stop by the library for an hour or two each day to use the internet. I used to do so many more things when I was younger; draw, writing and recording music, reading books, going fishing, building random crap in my father's shed, and constant writing. Now all I do besides sit online is go on bike rides and force myself to work on recording music. I work full time as well, but I also had to work along with going to school as a teen, and still managed to do all of those things that I listed.
I've actually thought about this a lot over this last year, and I think the internet had a lot to do with stalling out my life. I remember moving out and getting a connection that wasn't free Netzero dialup, and there was suddenly so much more of the internet. And then 4chan came along... I doubt that I would've been a wildly successful writer or musician otherwise, but I may have at least continued to be productive and would probably be creating things of decent quality by now.