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Why do I sometimes see questions with tags that I don't watch on the home page?
I dislike it and I always have to add a new tag to my list of ignored tags.
Will there be an upgrade to this feature?
I ask this question because I see questions with tags that I don't have in my list of interesting tags.
Tags watching only highlights questions; it does not block them. In the past I have seen people maintaining long lists of ignored tags (like you seem to be), but this isn't a good solution (as you've noted).
For Stack Overflow (and Meta Stack Overflow and here), you should use a custom view with Custom Question Lists:
See Custom question lists is available for testing for more information.
Otherwise, you can just bookmark a search like [java] or [javascript] or [php].
Tag watching is not a whitelist. Tags can be in 3 states: ignored, watched, and normal. Ignored means that such tags don't appear on your home page, ever, and any list of questions which include such tags will have that question grayed out. Watched tags means that the questions will appear highlighted on your home page (and on Stack Overflow, the filtering algorithm will filter out fewer questions with those tags). And normal is... normal.
The main thing that tag watching does is give you easy access to the tag itself. You see it on pages that list questions, so you can quickly select a tag and see the most recent questions on it.
