I haven't used actual bookmarks in a long, long time. Typing the first couple letters of a URL into the Firefox URL bar and then arrowing-down to pick the one I want worked great for me in Firefox 2.

At first, I was afraid the Awesome Bar in Firefox 3 would mess up my usage patterns, but I found that when I relaxed and just "went with it", it made things even lot faster and easier, making bookmarks an even more distant memory. I like the Firefox 3 Awesome Bar even better than the Firefox 2 URL bar behavior.

Google Chrome seems even better to me somehow, it's like they refined the Awesome Bar behavior even further. I'm not sure exactly how without analyzing it, though.

I guess what I'm saying is that this seems to be the next usability advancement; making bookmarks a thing that we only use occasionally. So roll with it. It's not a bad habit, it's taking advantage of the new wave.