I couldn't live without computers. The Internet is my window to the world and the source of all information. I can't imagine not having instant access to encyclopedias, music samples, schedules, reviews, prices etc.
Even the disconnected computer is useful for information storage, retrieval and processing. It's much easier to keep track of finances on a spreadsheet than on a piece of paper.
Nope, the computer is the best invention of the 20th century.