Huh. I guess it's just, because I am new to Hammer. I think like you said in your videos getting a good sense of scale is more challenging than it looks. Like with my map (it's in the WIP thread somewhere) the first iteration made the player seem like an ant, but now I think I have a happy medium.
My only issue (that I am working on) is that props seem far too small, but I don't want to make my tower smaller, or else it will seem cramped.