We're pretty self-sufficient, as much as you can be while living in an apartment. In fact, we do just about everything on this checklist that are supposed to save you a few bucks, except for the thing with the air conditioner. The additional benefit which is almost never touted is that most of these practices are pretty green, too.
And really, it's not all that inconvenient to make your own cleaners, cook your own meals, clean your own house--this has the added benefit of turning you into an anti-clutter freak and keeping hoards of stuff from building up--repair your own clothes, etc etc etc. I suppose you could consider the convenience of buying all of these goods and services worth it if the time saved amounted to enjoying your life more. But really, what are we doing with the time saved? Odds are, you're watching more TV (I've been sleeping this week).
I've never seen WALL-E, but it's extremely tempting to make a comparison between the space-blobs in the movie and the current helplessness of people in general: the degree of our dependence on technology has infantilized us to the point where we're completely divorced from our "natural state". The optimist in me says this can't possibly be for real, but I begin to despair when I consider that many people apparently don't know how to put a button back on.