I could have written every word of that post myself. In the early 2000s I was in an even worse state: I was spending up to 15 hours a day on just one site: AudioGalaxy. It's been gone for years, but back then it was a crazily active site with 1000s of subforums and groups. Unlike the bland FB clones of today, this was also a website with a distinct design: but in a good way, not a bad one. It didn't blind you with acres of white, but had a lovely deep blue background.
Anyway, I think I was actually addicted to AG in a rather destructive manner. Nowadays the internet is like a bad habit, but not an addiction: I could go away for a week and not miss being online at all. In 2011/12 I was hospitalised several times, with the average stay lasting a week. My local hospital is far too primitive to have wifi in its wards, so there was basically no way of accessing the internet.
Not only didn't I miss it, I found it rather refreshing. I got more reading done. I rarely felt bored. However, I have never tried imposing a week's break on myself: breaks have always been enforced from the outside. It's probably someting I ought to at least give a go. Imagine it: no posts on WP from me for a whole 7 days - won't that make people glad, er, I mean sad?! :p