Claire, you bring up some very good points. It's perhaps the case that I've had one too many of my husband's home brews to adequately discuss them, but I will try a little bit.
I will grant, I do not need this camera, but I think I want one. I think this is one of the fun parts of a hobby, buying things that one don't necessarily need. Also, since it's a hobby, I buy really used and wait out the cheapest deal I can, since I can't justify it by telling myself it's ok because I can write it off. Also, I print at an art center darkroom, so I don't have to worry about print size and buying new trays, enlargers, etc...all that stuff is already there.
"The more cameras one owns the less facile one becomes at a particular camera's infrequent use."
I get that, it makes sense. considering...
"However, you will be distracted by having your husband there."
you know, you may be right, but he's really great. He's super patient, waaaayyyy more patient that I would ever be if the tables were turned. I'd be all "can't you set up that shot by now? Let's GO!" And he's never said a word to me. Never. Anyway, he entertains himself while I do my thing, he's great. I think I could probably (maybe, don't want to press my luck) even go out with LF and he'd be ok with it all. (Someday when I'm not totally intimidated by LF, I'll try it out and see.) He just takes pics with his digicam, then tromps around with the dogs, then tromps back, and tromps around some more. Sometimes I feel the pressure to hurry up, but none of it's from him. Also, the project I have in mind has to do with some land his family owns, so it's not an issue, really. But still, I have considered it, and will probably continue to do so.
"If however, you were to be sometimes be working with a dynamic subject, for instance a child,"
Not likely to happen!

Not mine, at any rate! ;0 and if I were photographing someone else's child I'd be bringing my Nikon which I'm pretty familiar with.
"perhaps enough so that a creampuff could be consumed with exercise offsetting calories injested."
Yup, have thought of that, too! And really, I don't intend for my husband to carry anything other than the tripod, and he only carries that b/c it straps on his pack nicely and I can access it quickly. I'm not a *total* wuss, except for when I am a total wuss...

I'm not really looking for super quick use, I kind of know what I'm getting into, but I'm just afraid if it's *too* heavy I won't bring it out at all. I just want to be comfortable while hoisting around a brick.

Thank you for your point, though, it's all great stuff to think about.