I don't mean to criticize anything about your line of thinking because it sounds like you're doing what makes sense to you and you're happy. So who am I to tell you you're wrong?
However, I do feel that your description hints at the essence of what I was saying earlier: that avoiding a large monitor is somewhat like self-deprivation. You don't want to get spoiled by becoming accustomed to the increased productivity yielded by a large monitor with a large virtual desktop. You're a mobile worker, so that makes a lot of sense. I do most of my work at either my office or at home. So I have two modestly-powerful workstations with lots of monitors at each location (in total, I've spent about twice as much as I would have to buy a high-end laptop).
Because I am not a mobile worker, I have a particularly small laptop (a Surface Pro). I feel crippled when I try to do serious work on my laptop because the screen is so tiny and there's so much context hidden by windows stacked on one another.
In a further-out future, I hope that laptops (or whatever portable device we carry) can one day project a very large, very high-DPI display of their own, giving you and me the best of both worlds.
If I read you correctly, you'd love to have the increased productivity of a larger virtual workspace, but today's technology and your need to be mobile keep you thinking it's best to focus on mobility first. That makes a lot of sense.
I totally agree that the current batch of 30" displays are disappointingly low-resolution. So much agreement on that! Primitive, stale technology, stagnant for 8 years. But I think I've already said enough about that in this thread. :)