Oh, it is definitely no match for the SSD. I can't wait until the prices of the decent sizes catch up to something that would make the switch a lot easier. I haven't noticed the drive being loud, but I have so many fans in my machine and it is blocked from a direct shot to my ears, so I probably haven't paid any attention to it.
Ah, that explains!

Trust me, the Velociraptor is easily twice or three times as noisy as a regular HD. But if you can live with that, it's really a very good drive!
Oh, BTW, thanks for the link to TreeSize Free. It seems this was just what I needed. Ok, it doesn't show this info in win explorer, but turns out I don't need it to. It shows a directory sorted by the space directories consume. And clickable through to the subdirectory that is actually the big space hog. Very nice, works like a charm!
Thanks! (and thanks to you all for all the other suggestions as well!)