Okay, I know this is little too fussy on my part, but blame the forum people for coming up with this idea. Nothing wrong with taking time to look at your ecommerce shopping cart. In fact, I still believe in the adage "Simplicity in structure is a true masterpiece and is really deceptive because one doesn't see the hard work behind it." If you can exert more effort to make things simple for your store shoppers, then you score plus points from them.
Much has been said about making the ecommerce shopping cart efficient and so many techniques have been devised to make this happen.
The process of filling up credit card details is a good example. Imagine yourself typing in all the numbers and realizing the fields are separated every 3 digits. Or, if you are required to format the date. Or, if you typed in the wrong details and went all the way till the last page before you got a "Ooops, error in xxx field. Please fill up entire form again!" message. These little things may cause annoyance and even ecommerce shopping cart abandonment. Do you have an excuse?