Is a bit. I've been spending the previous few days rearranging the twiglets and dancing by myself...
I'm reluctant (unlike one or two other posters on the old thread) to talk about what's poly and what's not poly. It's just a catch-all term really, for various kinds of consensual non-manogamy (and I loathe the term non-manogamy because it's just reinforcing the idea that monogamy is the 'ideal' and anything else is less than/anti) so for me, anyone who is in a relationship which falls outside traditional mon-normative setups, and whose intimate relationships include more than one person (at whatever level and whatever the nature of those relationships (ie not necessarily sexual) with the full knowledge and consent of all parties is 'poly'.
So I don't think you should worry if you fit within some set of rules, or whether you've got it all worked out yet. Poly is a broad church and is more an attitude than a proscribed set of circumstances.
I too have no desire to settle down with one man, 24/7/365. Some will say this is just a reaction to an unhappy marriage. I would say that I have always felt this way, enjoyed my own space, liked living alone, never felt the idea of 'one person, for everything, forever' to be something I understood or felt was right for me. But I simply didn't know there was another way to be, or do relationships. Also, I was younger and less brave and certain of myself than I am now. I certainly gave far more of a shit what people thought of me back then than I do today.
With regard to my current relationships, they're evolving things. I've learned that you can't decide at the outset what form a relationship will take in the future. You can't stick it in a box, place limitations on it and expect it to fit that box forever.
My relationship with DP and OSO started out as a kind of FWB relationship. But it quite quickly developed into something much deeper and more profound, and which is actually a lot more rewarding for all of us. But it's taken work to manage that transition, on all sides.
There's a freedom in stepping off the well-worn path of monogamy, but at the same time, there are no road maps, and working out your own path, respectfully and honestly, takes work, lots of communication and a lot of hard thinking.
It's not for everyone, and that's ok. But monogamy is not for everyone, and that's ok too.