It's so easy to get used to. Within a week, I was single-clicking icons on my Windows machine and then staring blankly at the screen waiting for things to happen. I finally had to switch my Kubuntu machine over to the double-click standard, and so now I do the click-and-stare routine on both machines. It's especially fun when I'm demoing something at work, and I click once and then stand around looking like a fool while nothing happens. Linux has ruined me.