Do you not use it to provide additional information, (not just on links)?
You don't include a very brief detail of what can be found on that page/section?
Occasionally, when I feel it's necessary. Personally, I find tool tips to be annoying: I prefer to not need them.
I simply see little reason to make use of an attribute which conceals the information unless they're a) using a mouse, B) using a screen reader with verbose title settings or c) examining the source code. If the additional information is critical, it should be on the page. If it's optional, I'd prefer NOT to provide it.
This isn't a carefully worked out and tested theory, however --- I don't know, from a user preference perspective, what might be generally preferred. However, I
really dislike having things popping up all over the screen. There are worse things than title attributes as tooltips, though...
From WCAG 1.0:
1.1.1 TITLE: The document title.
Note that the (mandatory) TITLE element, which only appears once in a document, is different from the "title" attribute, which applies to almost every HTML 4.01 element. Content developers should use the "title" attribute in accordance with the HTML 4.01 specification. For example, "title" should be used with links to provide information about the target of the link.
6.1 Link text
Checkpoints in this section:
* 13.1 Clearly identify the target of each link. [Priority 2]
Good link text should not be overly general; don't use "click here." Not only is this phrase device-dependent (it implies a pointing device) it says nothing about what is to be found if the link if followed. Instead of "click here", link text should indicate the nature of the link target, as in "more information about sea lions" or "text-only version of this page". Note that for the latter case (and other format- or language-specific documents), content developers are encouraged to use content negotiation instead, so that users who prefer text versions will have them served automatically.
In addition to clear link text, content developers may specify a value of the "title" attribute that clearly and accurately describes the target of the link.
If more than one link on a page shares the same link text, all those links should point to the same resource. Such consistency will help page design as well as accessibility.
If two or more links refer to different targets but share the same link text, distinguish the links by specifying a different value for the "title" attribute of each A element.
In general, these specification only _require_ a title attribute in contexts where the link text is repeated. Better practice, of course, is to avoid link text which is repeated.
I will use the title attribute when I don't see another option: but if at all possible, I prefer to provide explanations, needed details, or descriptions in context.
The important thing, however, is to realize when you really must not
use the title attribute: when you're duplicating link text, duplicating alt text, or creating any other type of content redundancy on the page.