Here's the command I found to set the default gnome-terminal height:
gconftool-2 /desktop/gnome/applications/terminal/exec --type string -s 'gnome-terminal --geometry=85x40'
Now when I hit "meta-t" I get the size gnome-terminal that I like.
Oh, to get "meta-t" to work, you might want to set this as well …
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