It's also one of modus's opinions. Not always something I agree with.

Even not often.
#1) mostly agree with, however he notes that Win2k's NTFS uses only 512 byte clusters. That's wrong. By default NTFS uses 4k clusters for anything over 2GB. 512byte clusters are for 512MB or smaller drives. (Also if you convert from FAT to NTFS, it formats with 512byte clusters due to data alignment issues.) While the issue of slack space is still minimal, it's not quite as minimal with NTFS as he makes it seem.
#2) What "hassle" and "wrestling" with partitions? It's pretty damn easy to make a partition and store files on it. And while the performance gains from optimizing the swap file's location may be minimal, some people are trying to eak out every last drop and will begrudge you even a few points in benchmarks.
#3) There are freely available partitioning tools besides FDISK, however none are really user friendly. But if you're considering partitioning, it's not due to not having enough drive space or because you expect huge performance increases. It's because you feel a need for partitioning, and just getting a bigger drive is likely to just make you feel the need even more (for example thinking that you want to organize files easier; larger hard drive means you're going to feel a need to fill it up, meaning MORE files you want to organize).
#4) Already expressed most of this myself, partitioning doesn't save any time with restoring your system. However I do disagree with the idea that having your data files on a separate partition is stupid. It's certainly faster to have your data on a partition that's NOT being erased, than to have to go dig out your backup media which may contain days or weeks old copies of your data. Even with a fast CD drive or something, it's still easier having it already on the drive. A backup is still obviously a good idea in case of a real crash, but if you just screw up the system so you can't boot and need to wipe the drive, it's easier with a separate partition. I also disagree that one can always just install over the existing OS. I'd never attempt that except in dire need to get the system working at base functionality to save some data, and then I'd wipe it when I got that data. (Oh yeah, and DI4.0 crashed while writing to my CDRW drive.)
#5) Agree that it's not really any easier organizing, but I don't think it's HARDER to have separate partitions. He makes it sound like selecting a different drive from a drop-down is somehow more difficult than selecting a different folder (oftentimes having to move UP in the file system first in order to get out of the default folder).
Heck, I wonder about his last comment. I don't know why he doesn't suggest that you install compatible OSes like Win98 and Win2k to the same partition in different directories.
Modus tends to have opinions geared toward the lowest common denominator of users. I.e., the people that just want a computer that works, isn't expensive, and doesn't take much know-how. His ideas are NOT geared towards power users or people that want to get the best performance they can, whether it costs more money or not (or who want to squeeze as much performance for their money as they can).