I find being a SAHM stressfree, it is one of the reasons I do it.
My being a SAHM also makes DH's life less stressful, because our children are just that our children, they are as much his responsibility as mine. He would need to sort out childcare and cook their dinner and attend to their day to day needs if I was not here or if I worked full time.
One of the many assumptions on these threads is that the working partner in the equation either didn't want children or views them as totally the SAHP's responsibility and idea. That just simply isn't true in our case. DH desperately wanted both our children and is an awesome father, he is also very driven and really wanted a career. We found each other, what we wanted and needed clicked together perfectly.
He does work a long day, but comes home to a family who loves him and who appreciate his efforts.
It can all get a bit 'Hallmarky' here sometimes, but I actually view that as a good thing. We have made something wonderful together, it may not last, it could be broken, but it is still wonderful and is strong, so will not break easily I believe.