7" is too small for me for every day use. I carry the iPad 4 around with me everywhere and really don't mind the larger size.
Also, playing games on the iPad is much easier on the mini than the big one...just because I can hold the smaller one for longer periods of time.
Update: I have both now lol, I'm sure I'm driving best buy crazy. My wife complained about the weight of the 4 and said she missed the mini so I repurchased the mini. I'm must confess I like both equally, it was a hard choice that drove me insane but now time to enjoy them both!