I don't have any problems with the thinner bezel on the Mini. The iPad Air though, is heavier, and the size means that the weight has more leverage. I'd like a little more surface on the edge so that my thumb doesn't feel like it's going to slip off. As you say, I'll get used to it. A good case will probably make me forget it quicker.
The larger screen is only useful to me for one or two things, less than 2% of the things I do on the iPad. One is drawing. I don't draw a lot, but when I do any loss of screen size makes the task more difficult and/or less accurate. This task is the only one that makes me consider the rumored bigger iPad Pro as an option. Though I'm wondering how easy that larger tablet would be to hold and draw on. It would probably need a table.
Movies: bigger is better, as long as you don't have to actually hold the tablet up while watching. I rarely watch movies on my iPad, but I find it an much better experience than on the smaller Nexus 7, if if the Nexus has the better aspect ratio.
Photo editing: again, bigger is better. I do most of my photo editing (when I'm serious) on the 27" iMac, but the iPad is my backup and/or quick fix for casual photos.
So I guess, with the exception of drawing, my main reason for having the larger iPad is that it makes a better backup when the iMac is not available, or if it should die. Yes, I could get buy with the Mini, but I'd get by a bit better with the Air.
I'm not willing to give up those few things for the the greater mobility. After all, as you point out, it's not that much smaller, and therefor still needs consideration on how to best carry it around.