I wouldn't say addicted as much as infatuated.
I am going to slow down a bit so I don't burn myself out. I'd been focusing on SEO and other types of building for so long it's refreshing to just dive into places like twitter knowing the boring / hard parts are mostly done.
I have made countless contacts though that I'm sure will help and I've only really been on it since the end of April; seriously in May. Hopefully I'll see many more of you there as well.
Sue - I'd recommend adding ~50 people or so to "get the party started" then keep / talk w/ who you like and remove who you don't.
Real-time Twitter Search - Tweet Scan is a great tool for finding people who have been active recently in your niche. I search "Blogging, Blogger, Blogs" all the time.