If holding a full-size iPad is problematic, a mini should be a great fix. The weight is amazing.
With iPad 3's intro, some users said they'd never go back to non-retina and made it sound like suddenly previous iPad screens were causing them eye troubles, though they hadn't mentioned such previously. Now with minis, some users complain about full-size iPad weights, when they hadn't previously. So I understand Mikey's question. I chalk it up to enthusiasm for a new product.
I've always said lighter would be better for iPads, and better screens would be great. But I can appreciate iPads in all their incarnations so far, and have no trouble using non-retina or retina. For me, mini iPad is not enough new tech compared with what's available in iPad 4. But the size sure is cute and tempting. If they freshen the mini's guts to iPad 3-4 level, I might get one the next go-around.
I think it is enthusiasm to a certain extent. And another part of it is that things just get lost in translation. For example, I've sat in the couch with my iPad 2 and 3 for many, many hours. I just put up with hand strain because it was better than all the alternatives (except the phone). And you learn to put it down from time to time. Then, you get this 7-inch thing from Google...and all of a sudden, there is a new standard to which to compare. Hey, comparatively, that 10-inch iPad is heavy! And I had heard others saying it was heavy and I refused to believe them, because I was then grooving on using my 10-inch iPad on the couch. So, just like anything, the old normals get replaced by the new. Now, I'm obviously not preferring to surf with my phone when I can surf with an iPad, but as long as I can see the screen, the mini is a better deal for that usage mode than the regular. As would be the GN7 or even your Note! Me, I'd still rather keep my phone small and use a tablet when I feel the need for a larger screen.
But I don't think Mikey's needs to feel as if his iPad is no longer any good. It's just as good as it always has been and if it is serving his needs, he should keeping using it. I not about to go tossing out my iPad 3. That screen is still fantastic. IMO, the mini cannot replace it, but I can do something better than the other.
For me, a 4 and a mini are different beasts. If I saw them as the same I would not be interested in both of them. We can't yet get a device with the 4s innards into a mini and have it perform well. So we have to wait and hope all the technical issues can be addressed to make such a device feasible. If it does happen, then I'm going to have a hard time justifying to myself to have the larger one. I know, the better screen is better for movies. I don't disagree. But my TV is really, really bigger and I will pick that over either of them. On travel, I can live with the 7.9 vs a 9.7 inch screen for the times when i'm watching movies. Both are compromises, so I just choose to go with the lighter one. I can see others making a different choice there, though.
I have to admit that if I didn't already have a retina iPad I would not get the mini as my first device. I would do just as you are doing and get the 4. This mini, while nice, is no match for the 4.