WYSIWYG, the acronym that's fun to say, tricky to type, and painful to see on an RFP. I don't have an abiding hatred for WYSIWYG editors, but I'm not terribly fond of them either. However, understanding that most people can't grok HTML (the same ones who don't know what grok means, perhaps), I can see why people appreciate them. Unfortunately, in Drupal, WYSIWYG editors can cause a world of hurt.
I'll be brief: if you're building a site that requires WYSIWYG, do yourself a favor and alter the settings so the editor defaults to disabled and is added only to specific fields on a "need to use" basis. If you're maintaining a WYSIWYG module, do the rest of us a favor and have them default to disabled in most areas with the ability to opt-in specific textareas. I've been managing CKEditor on a client site, and it has a nifty pattern matching system for tweaking the visibility of the editor on various fields. (I still think it might default to being enabled everywhere, though.)
Why? Am I just being crotchety? In truth, while there are routinely used textareas on which the end user might benefit from a WYSIWYG editor, there are an equal number of textareas scattered around Drupal's administrative pages where editors just get in the way. Even worse, most seem to add empty p tags to textareas when their form is saved "just because." I'm not sure how it is for other module maintainers, but at least with Ubercart we regularly received puzzling support requests about simple features not working. This might be an e-mail that doesn't get sent because the textarea where the end user specifies multiple recipients (one per line... sound familiar?) has HTML in it that the end user can't see... thanks to their helpful WYSIWYG editor.
A less is more approach will benefit the end user and the module maintainers. Furthermore, an editor is often just visual clutter, like on the message textarea of a contact form. I don't suppose people usually compose contact form submissions in Word?
There might be modules out there that already operate like this, so please don't take this as an indictment on any particular module. Also, if anyone is aware of a WYSIWYG module like Unfuddle's, I'll give you a bearhug at the next Drupalcon if you'd be so kind as to link to it in the comments. If you haven't seen what they do, you should. It's my ideal solution if someone could ever bake it into a Drupal module.