Rosalind - 4:40 pm on Nov 9, 2012 (gmt 0)
Not interested in youtube tags but helps a lot in wordpress sites to increase number of pages in site
This is a bad thing. Pages and pages of tag category soup will dilute your crawl budget and clog up the SERPs with useless junk. It encourages duplicate content and probably attracts pandas like spam-filled bamboo.
YouTube probably has a very good idea of what makes SEO sense. Moreover, I don't remember the last time I deliberately visited a tag page.