I never, ever thought I'd wear Crocs, but here I am.
Our 1.5 year old daughter loves her Crocs, and we like how easy it is to get them on, how we don't have to fuss over socks, etc. They're great summer shoes for kids. After a while I started thinking about getting myself a pair just as yard work/grilling/fishing/etc. shoes for the same reason. Which is what they started as, but during one Home Depot trip I realized I never took them off and was wearing them out. Fair game, I guess I'm living the Croc life now.
Regarding sizing, I saw some strange advice all over. And perhaps it's different between colors, so for clarity's sake I got the Khaki color. Anyway, I saw some people talking about sizing down, but I really don't think that's the right way to go. Crocs do feel loose on your feet, but just wear them around a bit and you'll realize that they're just fine and very secure. The bottom "floats" a little bit so you don't develop blisters, but the strap holds them to your feet pretty well. If this were a normal shoe, then I'd size down. But it's not, and it doesn't wear/stretch/weigh the same, so I recommend getting your true size. I'm a 12D, sometimes 11.5 or 12.5, and once in a blue moon a 13. Size 12 works fine for me here.