It turns out that the behavior I described in my original post (shrinking the inner pane rather than displaying more text in the full-sized pane when a smaller font-size is selected) appears to be caused by tiling window managers and vim's interaction with them. The original behavior was seen on an up-to-date 64-bit Arch Linux system using just the xmonad window manager (no desktop system). On a hunch, I tried the same thing (reducing the font size) while running fvwm instead of xmonad and got exactly the behavior I wanted (the size of the window and the text rectangle within it was unchanged and more text was displayed). I then tried the same experiment with i3, another tiling window manager like xmonad, and the behavior was the same as observed with xmonad. So for this particular case, based on a small amount of data, it appears that vim and tiling window managers are conspiring to produce poor and unexpected behavior. It is possible to do this correctly with tiling window managers; I just tested gedit and emacs with i3, and making the font smaller works correctly in both cases.
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