Absolutely. My ex-mother-in-law just lost feeling in both arms, she can't even feed herself.
I have the same thing, and it may happen to me in the future and I was just thinking the other day, how will I live without the ability to communicate or surf the web on the computer. This is great.
Opera has had voice navigation for a while on the desktop. I don't know if it types-in the URL for you, but I believe you can at least browse back and forth, select links, select speed-dial, etc... I haven't played with it much, because, as the article says, its not practical for most of us.