For my livelihood? Absolutely dependent on it. I would be sunk if I couldn't access the NCBI or Pubmed. I use it to communicate with people over seas, to obtain data from overseas, to get PDF's of important papers..... it's absolutely vital to my work. If researchers didn't have the internet, we'd have to go back to the old "order-papers-by-mail" which would slow down research significantly. Without the internet, specialists would have to visit IN PERSON to explain their data to other specialists.
21st Century science NEEDS the Internet. Especially Biologists.
Police depend on the internet to send Forensics data. The Military needs the internet to efficiently organize logistics. Navigators and professional hikers and explorers depend on GPS, which isn't the internet, I know, but they then need the Internet to send that GPS data back to base.
The packaging industry in the Western world needs the internet to keep track of its packages. Hospitals use the internet to quickly send patient information. The world cannot function without the internet any longer. It has become an integral part of our society, like it or not, and I do like the internet because it makes things so much more efficient. I cannot begin to tell you how the internet,combined with computerized equipment, has improved the speed and quality of biological research. Using microarrays, we can analyse the regulation of HUNDREDS if not THOUSANDS of genes in a DAY and then send that data to our colleagues in X nation within a minute or less over the internet. Go back 10, 20 years ago and such a project would have taken YEARS and would have led to a few PhD graduations.
No, the Internet is a wonderful thing. It's so powerful, and I don't think many people fully grasp that.
Personally, the internet is my main source of obtaining news. I don't want to wait until CNN comes around to the story that interests me, I will just log on to CNN or BBC or Reuters and find a full list of stories that I can read when I want to.
The internet is my primary source of entertainment as well.
But as long as I have access to it at work, I could easily survive without it at home. None of my social relationships depend on the internet and my happiness does not depend on the internet. I still read a good amount of paper books, I still watch TV occasionally and I still talk with my family. So personally, no I don't depend on the internet.
Professionally? The internet is the life-blood of modern day scientific research. It's freaking GOLD. It's amazing, useful, wonderful and utterly necessary.
I thought I'd never say it, but thank you DARPA.