As your self one question:
Do I use the revisions?

If it's no, then it may be worth using the methods listed to disable them.
Some people like having them to fall back on. And if you don't have a large amount of posts, you may want to leave it enabled.

Now, being able to publish posts that are dated in the future – THAT I could really use. It may seem silly – and not what the "original intended use for wordpress" is – but I use that hack very often in various installs I've done. (and I hate having to hack core code to get it to do that!) I've tried writing a plugin for it and it didn't work. I tried using someone else's plugin and that caused all kind of problems. (This is one of those plugins I was hoping to be able to figure out how to write after the wordcamp meeting)

I know there are some specific ideas about how wordpress is to be used, but one of the things I love MOST about wordpress is how flexible it is (99.9% of the time) ;p I have clients come to me all the time with random crazy things they want to do and I'm like… you know, we can do it with wordpress and some custom query calls, and custom fields etc etc.

In any case – back to your original question. It's just a bulky feature I want to be able to turn off because I'm a tweaker.