If I am sick I take a sick day as everyone should..I don't want to spread my germs through a whole office who may end up alot worse off than me.
If one of the kids are sick, either DH or I will take leave, I get Carer's leave so it is usually me.
I don't take days of willy nilly as you just never know what is around the corner. I have worked with people who as soon as they have enough sick leave, the take a day off reguardless.
So yep, like you legitimate sick leave only. I try and scheduule Dr's appt's on a day off or the weekend, or early in the morning and then go in after.
If the thread you got the idea of is the one I am thinking...If I was going to leave my job..I would not go and take any sick leave I had accrued just beacause I was leaving