Before you feel bad for me, understand that I have good reasons for the decision and I'm happy with it. I'm definitely influenced by my husband's unhappiness about the whole idea (because he realizes the amount of time it would take and he's not happy about me basically being silent for a whole month), but it's only a minor influence: if I wanted to do it, I'd do it, and he would just have to cope.
The main reason is that, well, I don't want to do it. I've written a couple of stories since I got back from holiday in September, but I haven't written all that much, and I haven't been working on any of the languishing long fics that have been sitting around, and last night, I realized why. It's because NaNoWriMo has been lurking on the horizon, and I've felt that with the prospect of doing nothing but that novel for a whole month, I haven't wanted to get myself involved in anything else right now, because I know I'll have to drop it at 12:01 a.m. on November 1. This big project, scheduled for then, has completely stifled me right now. I didn't even work on a Halloween costume this year (last year was two months of happily creating my Fifth Doctor costume), and I wouldn't be surprised if it's partly because of the NanoRhino staring at me.
In a similar vein, I actually don't want to work on the story that I have plotted for NaNoWriMo. I was itching to write it back in July, but I told myself to save it for November, and now I don't want to do it; I have a number of other things that I'd rather be working on.
And therein lies the rub. NaNoWriMo, as far as I know, was intended to encourage people to be creative, to hunker down and imagine and write and tell a story. If it's stifling my creativity, my drive to write, then it's not for me. Everyone's different, and you have to do what's right for you. Maybe I work better when I have a number of different projects open and I'm jumping back and forth between them. Or maybe I'll finally finish that long fic I started last December. Or maybe I'll find myself writing that story I intended for November. Who knows? But I think it's better for me personally to leave my options open.