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A couple of months ago, I did something that has caused me great angst.  My website unique visitors was on a steady growth path for about 3 years. I swapped out my SEO plugin, from all-in-one, to Yoast.   I then removed all of my meta tags.   My site has about 2000 unique posts.  After doing that my unique visitors has been on a steady decline of me loosing traffic at a rate of 5 to 10% of my visits. Any thoughts on the best remediation plan I should use.  I put back in the meta tags, but wasn't sure of the SEO plugin switch caused the issue.

I am just curious if any of you use the premium themes such as Genesis or Thesis, if so why did you move to those themes?  Also what is the real benefit to one of those themes?  I know both claim to help with SEO, but I can't really understand exactly how other than the code may be more efficient.

I am currently working redevloping my site, I have terribly long URL's according to SEOMoz, can someone cover the real benefit of my editing my URLs, and then putting in all of those redirects.  Should I edit old material?  My site has been in wordpressformat for a couple of years now.