Fox - it's okay, I understand your point and actually, find it all quite interesting, if though as Gaelic points out, I wasn't coming on for competitive "how hard is my life". 
I think the point is that no matter what your circumstances are, there's challenges. You're absolutely right about the joy of not having to worry about gettring home if the train is late or a crisis comes at work and similarly, it's lovely knowing that if DS is sick, DH can take him to the doctor (as he did last week) without me having to a) agonise from a distance and b) rush home from work to do it.
On the downside, unlike mothers everywhere, working or SAHM, I have very little say over his day to day activities and food. Which is fine, but it's an adjustment. I also have to deal with DH's exhaustion/resentment on weekends. By the weekend, he needs a break as badly as I do. Intellectually, both of us get that we're both working hard but like SAHPs everywhere, by Saturday morning he has had it up to the neck with DS and just wants a break and is pissed off if I don't see that instantly (he's such a sweetheart he gets over it pretty quick, but still). He also gets frustrated because he has high standards and he feels guiltly if I'm doing washing on the weekend, even though I know, because I've been there, that getting more than a load or two done a week is bloody hard. And the (unnecessary) guilt makes him irritable and unpleasant with me.
And I'm knackered. I get up early to shower so that when DS wakes up I can spend some time with him and let DH sleep a little later. At work, everyone thinks I'm crazy and that me and DH should just get up at the same time and he can look after DS while I get ready for work. But I want to see DS. Plus, it might not be fun, but while I'm commuting, or eating lunch, or having coffee with a colleague I'm NOT working. But DH is working from the moment I leave the house. So the downside I am absolutely shattered. So is he. We've both been going to bed earlier than we ever have in our lives. It's the only way to stay on top of it. Currently, a movie at home after supper takes two nights to watch as one of us inevitably falls asleep about half way. It would be funny if it wasn't so exhausting! 
Incidentally, one of my frustrations is that I think working fathers with stay at home wives, should do more of the morning/evening efforts than most seem to. Or perhaps that's just where I work. But most of the men I know think they're doing really well if they get home in time for a story. It doesn't even occur to them to take on some of the morning responsibility, or to put any effort into preparing or planning meals. It's just not on their agenda. And that, for me, IS a feminist issue. I don't understand why SAHP are so often left to just handle everything. When you're both working, most couples have at least some seperation of chores that they each. But it's like a baby comes along and suddenly SAHP is not just looking after the child, but also doing all the washing, cooking, cleaning, shopping, planning etc. I don't get it.