Totally agree. The D4 charger is so big. The charger that came with my D80 was nice for travel but I ended up buying a different one that don't need the cord and has built US and Euro plug all in one. This way I didn't have to worry about adapters or not having enough adapters while traveling.
Must say surprised that there isn't a smaller travel charger yet for the EN-EL18 batteris. Would figure photo journalists and sport journalists would be using the D4 and would like a lighter smaller charger. But maybe I'm wrong there.
Still keep looking and if I run across one will update the thread here.