Since Add tag to page title when viewing specific tags, tags you're searching for / looking at are in the page title. I like this.
However, when I browse my favourite tags (https://stackoverflow.com/?tagFilter=favorite), all my favourite tags end up in the title:
I find that a bit much. I would suggest either placing a limit on the amount of tags in the title, but even better: if you're looking at your favourite tags, change the title to
Questions with favorite tags that need answers - Stack Overflow
or something like that.
Note: I didn't check if infinitely many tags would actually be allowed.