Ah, very true.
I have a few credit cards. Only have a balance on one and I more often then not forget I have them with me. For a while there (several years ago) I was almost living hand to mouth and the CC saved me. Lucky for me, at the time, it had a very low credit limit ($800) so even maxed out, it's not that painful. Now, I basically use it for larger purchases over the web and such so that I have some insurance protection against fraud.