I currently intend to use Javascript in my portfolio site for form validation, a stylesheet switcher, and perhaps the navigation.

I am aware that some users turn off Javascript when they browse, but I am wondering if they are a significant number. Many of the treads concerning this subject I found on other websites where rather old, so I would like some recent opinions.

I understand that degrading well and accessibility are important for many sites. I am trying to gauge how important it will be for my own.