I think the more insidious thing, Matt, is when labor is simply seen as not labor at all: Dad and Mom come home from their hard, for-pay jobs -- where they may or may not 1) make the same wage for the same work, and where, 2) if their work is different, the one is work is "feminized" is likely to make less -- and then they have to 3) clean up the house, make dinner, wash the dishes, and put the kids to bed.
Unlike the first two issues -- equal pay for equal work, and relative statuses of different kinds of work -- the third may simply be invisible. It isn't formal work structured for pay, so there's typically no tracking mechanism to make externally visible who's doing how much. And this means that, more than likely, the woman ends up doing most of it.
This is true (as studies have extensively shown -- anyone have the links?) even for couples who claim to be egalitarian, and who do not have "women should do the housework" as a conscious ideology.
It is certainly true of Esther and me when released from the constraints of our chore list. When, for instance, we are staying at my parents' house on vacation, it somehow is always Esther who ends up doing more of the dishes. This does not occur to me, I assure you, as a matter of me intentionally wanting to be selfish, nor of my thinking Esther's labor is worth less. It occurs to me as that I am in the middle of making this really important point, and then -- oops! The dishes are done.
Even where it's no one's conscious intention, observe some mixed-gender gatherings -- if there hasn't been specific process-engineering to counter it, generally the women will be doing more of the cleanup.
The reason this is distinct from just general classist "poor remuneration of blue-collar work" is that unlike the day laborer who knows perfectly well he's getting paid a crappy wage, someone cleaning up the dishes may well have the sense that she simply happened to get there first, and it does need to be done, and she cares more anyway, and she likes it done her way, and she doesn't mind, and he's hopeless at it anyway, and so on. In other words, ideology can render this kind of work invisible even to the worker... or where it's visible to her, it may be not visible to others, which makes it hard to negotiate about ("quit nagging, I took out the garbage!").
You will rarely find the landscaper's helper hauling wheelbarrows of mulch on the CEOs lawn saying to himself "well, this isn't really work, and I don't mind doing it, really it's relaxing for me..."
The other bit of your analysis I find dubious, is the claim that women's work is unskilled, and it's the bias against unskilled labor that mitigates against it's being valued. A reasonable definition of "unskilled" would be "I could pull someone random off the street, explain them how to do it in a few minutes, come back an hour later and be satisfied with the job they'd done." This is true of hauling mulch or scrubbing a counter, but it is manifestly absurd to say about raising children, cooking, or organizing the logistical systems of a house.