Haha...I haven't, but I have always wanted to say that! Wait I take that back, compared to my knitting 6 years ago, my skills are much improved. I have learned new stitches, how to read charts, knit cables, color-work, joggless stripes.......ya da ya da ya da.
All those are things that come with years of knitting, right? When I think of a new skill I have learned, it would be not being a perfectionist. I like my stitches neat and tidy, as much as the next knitter. I drool over some that even close up look amazing. Admittedly, I make mistakes. Rather than taking them out and sometimes starting anew, I now continue on my merry way. (If they are not too noticeable!)
This is a new "skill" for me. Not long ago if I made a mistake, I would take the project out completely or it would sit in my WIPS basket-forever. Believe me there are times I have to frog back 10 very long rows because it is just completely off. Luckily it is not all the time.
While I still dream of knitting the perfect stitch like her, I don't dwell on it too much. I have found that I get more done if I don't. :)