I've alo been using gentoo on my desktops for about the same amount of time, it's by far my favorite of all that I've tried. And while the ricer-level make options don't have as much effect on performance as they used to, I still like the configurability of the whole thing.
That being said, I wouldn't run Gentoo is a prod environment for any amount of money, it's debian or a redhat-based distro, all the way. The nuances of the portage tree from week to week just lend themselves to too much instability on what might get installed when you're trying to pull in an update.
Things like "Oops, we green-lit perl-5.16 when it should've been 5.18", and all your modules are broken and perpetually rebuilding for the next week, or "We migrated everyone from grub to grub2 and renamed the original grub to 'grub-static' and didn't tell anyone, sorry about any systems that don't boot"
I like to tinker on my desktops, I have zero desire to do so with production systems.