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There are a number of reasons you might need one in these sizes.
First, you might have a wider than average entry area either as the result of French or double doors. Your home's design might also feature a wide, open, entry area as do many of today's newer homes. In those situations a small mat looks like an afterthought rather than an intentional part of your home's curb appeal.
A second reason would be if you had a large family and have several little children at once stamping snow off their shoes before they come in the house.
A third reason is for layering. There's a neat decorating trend that calls for putting one functional mat on top of one that is wider and longer and might have a printed pattern on it in order to make your entrance seem more homey and welcoming.
No matter your reason your perfect option might be one of the ones below.