I at least am kind-of-polydrug-user, of the worst kind. On my non-mobile platforms I use almost daily at least Debian, Fedora, Gentoo, Ubuntu and on top of those 2 different strains of inhouse Linux, the first one a traditional LFS variant and the other a Koji-built own variant. Now when I think about it, Arch is maybe the only major distro that I have not used.