I must admit sometimes it is useful but i realy dislike it.
Answer
Yes. There are several cases in which this is hugely beneficial - in-text links that may duplicate others, links in large lists for which the user might be expected to visit several, links to anything that could be considered an 'object' in a 'set' (e.g. users in a social network), etc.
In main navigation, I don't think it's particularly useful. And it shouldn't be used to mitigate poor usability associated with bad link labelling (links should usually be labelled as closely as possible to the page they link to). The fact that visited links are 'forgotten' after a while is a shame, but this functionality is most useful during a session anyway.
There's an interesting associated security hole related to the fact that history can be determined based on link colour; there's a demonstration here.
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