Add the following line to your .bashrc file (of course you can change the dimensions to whatever you want):
Code:
alias gnome-terminal='gnome-terminal --geometry=80x42'
This will make every call of gnome-terminal actually call gnome-terminal --geometry=80x42. This way you don't have to go around and change the various launchers you have set.
You will probably have to log out & back in for this to take effect.
Edit: this only works if you are launching gnome-terminal via bash, which does not include most shortcuts or menu items (or, sadly, gnome-do).
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