I have been running various Linux versions for over 20 years (currently Ubuntu 14.04) and my Linux has never been infected even during rare times that Windows was infected on same computer. I even have an old PC (333 MHz Celeron w/158 MB RAM) in my basement with no monitor (running 24/7 since 2003) that I was using to learn smtp (e-mail transport) and name based virtual hosting with apache web server while infected Windows IIS servers were trying to spread various worms (code red, nimda, etc.) and while they inundated my server at times, they never succeeded in breaking in.
But I mainly use it because it is more secure and boots much faster than Windows using less memory and is ready to go once you get to the desktop. Windows always seems to have high CPU usage for quite some time after you get to its desktop doing anti-virus scanning, checking for updates, etc. (sometimes for 20 minutes to hours if it has not been run for awhile). But I am very familiar with Linux because I was running it and doing networking before Windows even had native dial up networking or a web browser (before Win95).
The reason I first got into Linux was because my first ISP gave us a shell account and apache web space in SunOS (Unix) and it was much easier to develop and test CGI scripts in Linux and simply upload them than to modify a lot of things going from Windows to Unix. I also helped people with virtual websites on FreeBSD and I have a remote shell account and web space on NetBSD servers. So other than minor differences I feel right at home and can find my way around any *nix like OS.
I have LibreOffice for office stuff, gimp for graphics or improving photos, color laser printer, network scanner, Hulu and Netflix (besides YouTube) for entertainment. And now with Linux Steam for gaming, who needs Windows?