No. Some of the packages conflict with other packages, meaning that if you have one installed, you cannot also have the other installed. Also, the download would be *EXTREMELY* large.
Why do you want to do that? To get the "complete debian experience"? If so, it's much better to search for the functionality you want, play with a few packages that seem to provide what you need, and stick to your favorite.
Tools you may be interested in getting acquainted with:
- deborphan (and orphaner, and editkeep)
If you're looking to "enhance your desktop experince", you may want to have a look at these packages (from my xsession): conky, unclutter, xfce4-iconbox, brightside, xplanet, khotkeys. Also, xset, xrdb and xprop are boring but useful (maybe).