In 168 hours Ubuntu 10.04LTS will no longer be supported as per the documentation online.

What happens to my PC if I still run 10.04 because I don't want to upgrade to 12.04?

I have 12.04 on another laptop I use throughout the day and simply said it slows me down unnecessarily and makes things problematic to find. Nothing has been easy. I don't like the scrolling thing on the left margin..... I can't access multiple desktops easily and anything one was once used to doing easily is now complicated by unnecessary steps and processes..
I don't like 12.04.

So what issues are working against me for not upgrading to 12.04 on my other PC?

Thank you...