It's *tall* for a single piece, no doubt, but its footprint isn't actually that big for a terrain piece. About the same as a large single ruin, I suppose. Arguably for most terrain the width is more important than height due to most models being normal-sized infantry.
So for large terrain, I would be talking about things like this:
I should point out, I'm not saying you *need* more terrain straight away or else all your games will be wrong. By all means, play with the terrain you have available and have fun with it.