Can't live without it!
I use it a lot for editing. It makes my life that much easier.
I don't use it that much, but I like having it there for those times when it does come in handy.
Eh. I can take it or leave it.
I don't. (Think anything of it, that is.)
I don't find it particularly useful, but it hasn't been a problem to have it there.
Not only do I never use it deliberately, it's annoying when I accidentally press it while typing something.
I'd like to strangle the @$$h013 who invented the bloody thing.
I don't think about it, either because it's disabled on my keyboard, or it was never available on my keyboard to begin with.
..."Insert" key? I thought you only did that to a lock...
Other (will explain in #2 or in a comment to this entry)