I'm not a computer programmer or a software professional. Still I have not touched or used a windows system or installed windows on my personal / work computers for last 9 years. I was using Ubuntu for about 6 years and Ubuntu Gnome for another 3 years. I have no problem making excellent presentations, writing reports, documents (libreoffice), editing basic images (gimp), editing music (audacity), making basic 3d animations (blender), video editing (openshot/cinerella), making brochures (scibus) or even setting up my own server (apache). Everything is damn easy (software center /apt-get). I enjoy gaming sometimes (gbrainy/majongg/wesnoth/supertuxcart etc).
I don't install flash and youtube works. Over the time other video websites have automatically started working without flash.
Life continues and without privacy issues, security issues and hassle of maintaining an up-to-date antivirus, life is much better.