I'm probably not the best one to respond to this, since I've made the very difficult decision to switch to formula, but I just wanted to say that I hear you. I think it should be OK to have complicated feelings about breastfeeding at times, and it should be OK to express those feelings. As women, we're constantly bombarded with contradictory messages that we should be both independent and sacrificial. If you've internalized those messages, to any degree, like I know I have myself, then breastfeeding can lead to even more ambivalent feelings. I've become quite wary of women who are black and white about the topic, no matter which side they're on.
It sounds like you're being very clear-headed as you think through the pros and cons of the issue, so I won't offer any advice. Pumping in public is awful--it just plain sucks. And I admit that I get resentful about my husband sleeping through the nights too, especially when he complains on the weekends that I don't "get started on the day early enough." Oh really? Try getting up multiple times during the night and then being all energized and ready to go at 7 AM!!! (and somehow, even though we're mostly formula feeding now, I'm still the one who gets up during the night to feed the baby)
I will admit that the freedom from having to be physically present to feed my baby is nice. But you know what? I don't even take advantage of it. The longest I've been away from her is about 5 hours, and I was so ready to see her again at the end of it. Even though a weekend away sounds nice at times, I couldn't do it--couldn't be away from her that long. And I'm possessive about feeding her too, even though I don't have to be. So maybe it's the thought of freedom that's more liberating, rather than the actuality of it? I get what you're saying, though, about how you have to constantly be thinking about your breasts, regardless of where your baby is. So in that sense, there is no freedom, ever.
I made the hard decision to stop breastfeeding because my severe anxiety about mastitis and another breast abscess were having negative effects on every aspect of my life, especially caring for Elodie. I strongly believe that children are very in tune with the emotional state of their parents (I know that I was as a child, and I grew up with a depressed mother, and it was not good for my own emotional health). So I think that if you're starting to feel dramatically and increasingly resentful, perhaps you will want to re-evaluate your situation at some point and address certain issues. But I will agree with your assessment about switching to formula: it does come with a lot of guilt, messy bottles, cost, and the feeling that you're no longer the sole source of nourishment and thus you are somewhat replaceable. So I would say that if there's any part of you that still finds breastfeeding enjoyable, then soldier on because it's a beautiful thing! There are going to be complicated feelings and inconveniences, no matter which feeding method you choose. But I also think it's totally OK to air your feelings, and I totally get where you're coming from.