Hi, I am writing a paper and answers to these questions will be very helpful for it.
1. What made you start using Macs?
Windows Vista. It had a pre-service pack 1 bug that made transferring large amounts of data from one drive to another impossible. I was mad that a little $300 eeePC running an obscure version of linux could do it but my $1500 Windows laptop couldn't. I sold my laptop for $500 and went online and ordered a Mac. I haven't looked back.
2. What did you use before you used Macs (if anything)?
Windows and occasionally linux.
3. How long have you been using Macs?
About 5 years.
4. Why do you use Macs?
They're much more stable than Windows (I support Windows, Mac, and Linux environments for a huge number of users for a living so before anyone counters this, I promise I know what I'm talking about.)
Mac handles large data sets much better than Windows.
Mac has a lot of nice features for heavy multiaskers built in (quicklook, mission control, far more thumbnails with icons matching the file contents).
5. What is your opinion on other operating systems?