I'm in the same situation now with Debian Squeeze that I was in back when Debian Lenny was the stable release:
I can't think of a system that allows me to do so much, so efficiently and without trouble as Debian Stable.
Debian Stable can be boring. Nothing new enters the archive. Except this time I'm using Debian Backports, the Liquorix kernels built for Debian, the Debian Mozilla Team APT archive, Google's Chrome browser repository and Dropbox's Debian/Ubuntu repository in addition to Debian Multimedia to shape Debian the way I want and need it.
So as much as I'd like to give some of my other favorite operating systems a try (Ubuntu, Fedora, OpenBSD ...), I'd be crazy to give up Debian as my daily workhorse operating system. It works without complaint. And that means I work without complaint.
I can't help but think that a key component of all of this is the GNOME 2 desktop, which is on the way out in favor of the still-controversial (and not all-the-way functional/finished) GNOME 3. That will come into Debian by the next stable release. Let's hope it works.
Back when I was running Lenny, I got bored and tried to dist-upgrade to Squeeze (then the Testing release, and I don't think there were release notes for Squeeze to help me do the upgrade right). I blew out the installation and then moved on to other systems.
I'm going to try very hard not to make that mistake this time around. Squeeze is running so very, very well that I am extremely reluctant to mess with it on my hardware (Lenovo G555 with AMD Athlon II at 2.1 GHz, 3 GB RAM, 320 GB SATA hard drive).
I don't write as often as I'd like, and my aim is to write less about what OS I'm running and more about everything (and anything) else. But I've been working very hard lately, using Debian to do it, and I thought it deserved a mention.
I tend to write more when things aren't working right, but with Debian, that's seldom the case.