I've been using Bloglines for a few years now, and I love it. Well, I don't love Bloglines (lots of issues in the past month or so), but I love the ability it has to collect new stuff (mostly on time...see comment above about issues) and put it in one place for me.
It took a bit of habit development to actually go to Bloglines to see the new posts. In the beginning, I would forget for weeks to check it and then it was overwhelming. Now, I check it each day at least once. I subscribe to about 170 feeds in many different categories (which I've organized into folders...technology, LIS, association news, the list goes on). I love that I can save things to go back to later and easily send myself (and others) stuff to file away or forward.
On occasion, I've toyed with the idea of switching to Google Reader, but, really, I does Google need yet another user?