I personally think that most buttons etc are way too big in AC generally.
Making it look more childish is a way - ok that might be a bit harsh. I like the size of the co-ordinates box and the number, and think that every pallette and dialogue box should be similar in size to this. But I can see where you're coming from. Now that AC9 is out and the new managment or pallettes etc is include, maybe there should be two sizes. Though I guess as the old saying goes cant please everyone all of the time.
Though again, some consistancy with sizing would be great. And keep it condenced I say.
GRAPHISOFT Product Manager