This is the irony that I love so much. I am jealous of your floor space and you are intrigued by the height that I posses. It is a blessing and a curse. It is nice to be able to grow some height but unless you have a lot of light until the plants get a bit taller they can suffer from lack of light and become deformed and ugly. So its a balancing act.
Definitely a grass is always greener type of deal. Putting ten inches of substrate in my 40 like a nub doesn't help anything either. My next tank will probably have both width and height, like a 75 or 90, but that is a whole 'nother beast.